diff --git a/css/base.css b/css/base.css
index 75bfc322..e76698da 100644
--- a/css/base.css
+++ b/css/base.css
@@ -505,17 +505,52 @@ table.permission-editor td.checkbox {
 
 
 /* Area which displays an error message */
-#alert-box {
-  background-color: transparent;
-  height: 0;
+.alert-box {
+  position: relative;
+  display: none;
   overflow: hidden;
+  padding: 1rem 1.5rem 1rem 0.5rem;
 }
-#alert-box.error-alert {
-  padding: 0.5rem;
+.alert-box .cancel {
+  position: absolute;
+  right: 0.25rem;
+  top: 0.5rem;
+}
+
+.alert-box.error {
+  display: block;
   background-color: #ffcdd2;
-  border-color: #d32f2f;
+  border-bottom: 1px solid #ffbfc8;
   color: #b71c1c;
-  height: auto;
+}
+.alert-box.warning {
+  display: block;
+  background-color: #fff9c4;
+  border-bottom: 1px solid #fff59d;
+  color: #607d8b;
+}
+.alert-box .cancel .material-icons {
+  font-size: 1rem;
+}
+.alert-box.error .cancel .material-icons {
+  color: #b71c1c;
+}
+.alert-box.warning .cancel .material-icons {
+  color: #757575;
+}
+.alert-box .icon {
+  display: inline-block;
+  vertical-align: middle;
+  margin-right: 0.5rem;
+}
+.alert-box .icon .material-icons {
+  font-size: 1.5rem;
+}
+.alert-box.warning .icon .material-icons {
+  color: #fbc02d;
+}
+.alert-box.error .icon .material-icons {
+  color: #ef5350;
 }
 
 /* List of contacts */
@@ -1488,7 +1523,6 @@ ul.tabbar li.active > a:after {
   border-top: 0.35rem solid #1e88e5;
   width: 2rem;
   height: 2rem;
-  -webkit-animation: spin 1.5s linear infinite;
   animation: spin 1.5s linear infinite;
 }
 
diff --git a/drafty.js b/drafty.js
index b845c3ea..cb30fa56 100644
--- a/drafty.js
+++ b/drafty.js
@@ -521,8 +521,6 @@ Sample JSON representation of the text above:
           return a.at - b.at;
         });
 
-        console.log(spans);
-
         // Denormalize entities into spans. Create a copy of the objects to leave
         // original Drafty object unchanged.
         spans = spans.map(function(s) {
@@ -536,8 +534,6 @@ Sample JSON representation of the text above:
           return {tp: tp, data: data, at: s.at, len: s.len};
         });
 
-        console.log(spans);
-
         return forEach(txt, 0, txt.length, spans, formatter, context);
       },
 
diff --git a/index.html b/index.html
index 83c8b517..69cecf43 100644
--- a/index.html
+++ b/index.html
@@ -15,9 +15,9 @@
     <!-- Styles for local elements -->
     <link rel="stylesheet" href="css/base.css" />
     <!-- ReactJs scripts -->
-    <script src="https://unpkg.com/react@15.4/dist/react.js"></script>
-    <script src="https://unpkg.com/react-dom@15.4/dist/react-dom.js"></script>
-    <script src="https://unpkg.com/babel-standalone@6.24.0/babel.min.js"></script>
+    <script src="https://unpkg.com/react@15/dist/react.min.js"></script>
+    <script src="https://unpkg.com/react-dom@15/dist/react-dom.min.js"></script>
+    <script src="https://unpkg.com/babel-standalone@6.26.0/babel.min.js"></script>
     <script src="tinode.js"></script>
     <script src="drafty.js"></script>
   </head>
@@ -133,7 +133,7 @@
     /* BEGIN Context Menu: popup/dropdown menu */
 
     // Function is used by context menu to set permissions.
-    function topicPermissionSetter(mode, topicName, uid) {
+    function topicPermissionSetter(mode, topicName, uid, errorHandler) {
       var topic = Tinode.getTopic(topicName);
       if (!topic) {
         console.log("Topic not found: " + topicName);
@@ -151,7 +151,14 @@
       } else {
         am = topic.getAccessMode().updateWant(mode).getWant();
       }
-      topic.setMeta({sub: {user: uid, mode: am}});
+      var instance = this;
+      topic.setMeta({sub: {user: uid, mode: am}}).catch(function(err) {
+        if (errorHandler) {
+          errorHandler(err.message, "err");
+        } else {
+          console.log(err);
+        }
+      });
     }
 
     // Context menu items.
@@ -164,6 +171,7 @@
             console.log("Topic not found: " + topicName);
             return;
           }
+
           topic.delMessagesAll(false).then(function(){
             console.log("refresh message list");
           });
@@ -232,7 +240,7 @@
         e.stopPropagation();
         this.props.hide();
         var item = this.props.items[e.currentTarget.dataset.id];
-        item.handler(this.props.topic, this.props.user);
+        item.handler(this.props.topic, this.props.user, this.props.onError);
       },
 
       render: function() {
@@ -280,13 +288,17 @@
     /* END Popup/dropdown menu */
 
     /* The X menu to be displayed in title bars */
-    var MenuCancel = React.createClass({
-      render: function() {
+    class MenuCancel extends React.PureComponent {
+      constructor(props) {
+        super(props);
+      }
+
+      render() {
         return (
           <a href="#" onClick={this.props.onCancel}><i className="material-icons">close</i></a>
         );
       }
-    });
+    }
 
     class LoadSpinner extends React.PureComponent {
       render() {
@@ -714,31 +726,20 @@
           login: this.props.login,
           password: '',
           hostName: this.props.serverAddress,
-          errorCleared: false
         };
       },
-      clearError: function() {
-        if (!this.state.errorCleared) {
-          this.props.onClearError();
-          this.setState({errorCleared: true});
-        }
-      },
       handleLoginChange: function(e) {
-        this.clearError();
         this.setState({login: e.target.value});
       },
       handlePasswordChange: function(e) {
-        this.clearError();
         this.setState({password: e.target.value});
       },
       handleServerAddressChange: function(name) {
-        this.clearError();
         this.setState({hostName: name});
         this.props.onServerAddressChange(name);
       },
       handleSubmit: function(e) {
         e.preventDefault();
-        this.setState({errorCleared: false});
         this.props.onLogin(this.state.login.trim(), this.state.password.trim());
       },
 
@@ -1000,20 +1001,11 @@
           </div>
         );
       }
-    })
+    });
 
     var SidepanelView = React.createClass({
-      getInitialState: function() {
-        return {
-          showErrorText: true
-        };
-      },
-      handleClearErrorText: function() {
-        this.setState({showErrorText: false});
-      },
       handleLoginRequested: function(login, password) {
         this.props.onLoginRequest(login, password);
-        this.setState({showErrorText: true});
       },
       render: function() {
         var title = null;
@@ -1046,17 +1038,16 @@
               onNewTopic={this.props.onNewTopic}
               onCancel={this.props.onCancel} />
 
-            <SidepanelView.ErrorPanel
-              showError={this.state.showErrorText}
-              errorText={this.props.errorText} />
+            <ErrorPanel
+              level={this.props.errorLevel}
+              text={this.props.errorText} />
 
             {this.props.state === 'login' ?
               <LoginView login={this.props.login}
                 disabled={this.props.loginDisabled}
                 serverAddress={this.props.serverAddress}
                 onLogin={this.handleLoginRequested}
-                onServerAddressChange={this.props.onConnectionSettings}
-                onClearError={this.handleClearErrorText} /> :
+                onServerAddressChange={this.props.onConnectionSettings} /> :
 
               this.props.state === 'register' ?
               <CreateAccountView
@@ -1095,16 +1086,31 @@
       }
     });
 
-    SidepanelView.ErrorPanel = React.createClass({
+    var ErrorPanel = React.createClass({
+      getInitialState: function() {
+        return {
+          show: false,
+        };
+      },
+
+      componentWillReceiveProps: function(newProps) {
+        this.setState({show: !(!newProps.level)});
+      },
+
+      hide: function() {
+        this.setState({show: false});
+      },
+
       render: function() {
-        var errorClass = null;
-        var errorText = ' ';
-        if (this.props.errorText && this.props.showError) {
-          errorClass = "error-alert";
-          errorText = this.props.errorText;
-        }
+        var icon = this.props.level == "err" ? "error": "warning";
         return (
-          <div id="alert-box" className={errorClass}>{errorText}</div>
+          <div className={this.state.show ?
+            (this.props.level == "err" ? "alert-box error" : "alert-box warning") :
+            "alert-box"}>
+            <div className="icon"><i className="material-icons">{icon}</i></div>
+            {this.props.text}
+            <div className="cancel"><MenuCancel onCancel={this.hide} /></div>
+          </div>
         );
       }
     });
@@ -1891,8 +1897,6 @@
       resetDesc: function(topic) {
         var defacs = topic.getDefaultAccess() || {};
         var acs = topic.getAccessMode();
-        console.log("InfoView: reset desc");
-        console.log(topic.public);
         this.setState({
           owner: acs && acs.isOwner(),
           admin: acs && acs.isAdmin(),
@@ -2104,6 +2108,10 @@
                 <MenuCancel onCancel={this.props.onCancel} />
               </div>
             </div>
+            {this.props.displayMobile ?
+              <ErrorPanel
+                level={this.props.errorLevel}
+                text={this.props.errorText} /> : null}
             {this.state.showMemberPanel ?
               <GroupManager
                 members={this.state.contactList}
@@ -2381,6 +2389,7 @@
         this.propsChange(nextProps);
       },
       propsChange: function(props) {
+        var instance = this;
         if (!props || !props.topic) {
           this.setState({messages: [], topic: null});
           this.leave();
@@ -2405,7 +2414,9 @@
               .withLaterDesc()
               .withLaterSub()
               .withLaterData(MESSAGES_PAGE)
-              .build());
+              .build()).catch(function(err){
+                instance.props.onError(err.message, "err");
+              });
           }
 
           // The user switched to the new topic before the timer for
@@ -2425,7 +2436,10 @@
           var oldTopic = Tinode.getTopic(this.state.topic);
           if (oldTopic) {
             if (oldTopic.isSubscribed()) {
-              oldTopic.leave(false);
+              oldTopic.leave(false).catch(function(err) {
+                // do nothing
+                console.log(err);
+              });
             }
             oldTopic.onData = undefined;
             oldTopic.onInfo = undefined;
@@ -2454,6 +2468,9 @@
                 newState.fetchingMessages = true;
                 topic.getMessagesPage(MESSAGES_PAGE).then(function() {
                   instance.setState({fetchingMessages: false});
+                }).catch(function(err) {
+                  instance.setState({fetchingMessages: false});
+                  instance.props.onError(err.message, "err");
                 });
               }
             }
@@ -2623,6 +2640,10 @@
                   </a>
                 </div>
               </div>
+              {this.props.displayMobile ?
+                <ErrorPanel
+                  level={this.props.errorLevel}
+                  text={this.props.errorText} /> : null}
               <LoadSpinner show={this.state.fetchingMessages} />
               <div id="messages-panel" ref={this.handleScrollReference}>
                 <ul id="scroller" className={chatBoxClass}>
@@ -2770,6 +2791,8 @@
           password: '',
           myUserId: null,
           errorText: '',
+          errorLevel: null,
+          liveConnection: navigator.onLine,
           topicSelected: '',
           loginDisabled: false,
           subscriptions: {},
@@ -2788,7 +2811,11 @@
         };
       },
       componentDidMount: function() {
+        var instance = this;
         window.addEventListener('resize', this.handleResize);
+        window.addEventListener('online', function(e) { instance.handleOnline(true); });
+        window.addEventListener('offline', function(e) { instance.handleOnline(false); });
+
         Tinode.enableLogging(true, true);
         Tinode.onConnect = this.handleConnected;
         Tinode.onDisconnect = this.handleDisconnect;
@@ -2798,25 +2825,39 @@
       tnSetup: function(serverAddress, transport) {
         Tinode.setup(APP_NAME, serverAddress, API_KEY, transport);
       },
-      componentWillUnmount: function(){
-        window.removeEventListener('resize', this.handleResize);
-      },
-      handleResize: function(){
+      handleResize: function() {
         var mobile = document.documentElement.clientWidth <= MEDIA_BREAKPOINT;
         if (this.state.displayMobile != mobile) {
           this.setState({displayMobile: mobile});
         }
       },
+      handleOnline: function(online) {
+        var newState = {liveConnection: online};
+        if (online) {
+          this.handleError("", null);
+        } else {
+          this.handleError("No connection", "warn");
+        }
+        this.setState({liveConnection: online});
+      },
+
+      handleError: function(err, level) {
+        this.setState({errorText: err, errorLevel: level});
+      },
+
       // User clicked Login button in the side panel.
       handleLoginRequest: function(login, password) {
         var instance = this;
-        this.setState({loginDisabled: true, errorText: '', login: login, password: password});
+        this.setState({loginDisabled: true, login: login, password: password});
+        this.handleError("", null);
+
         if (Tinode.isConnected()) {
           this.doLogin(login, password);
         } else {
           Tinode.connect().catch(function(err) {
             // Socket error
-            instance.setState({loginDisabled: false, errorText: err.message});
+            instance.setState({loginDisabled: false});
+            instance.handleError(err.message, "err");
           });
         }
       },
@@ -2844,39 +2885,33 @@
         if (promise) {
           promise.then(function() {
             instance.handleLoginSuccessful(instance);
-          })
-          .catch(function(err) {
+          }).catch(function(err) {
             // Login failed, report error
-            instance.setState({loginDisabled: false, errorText: err.message});
+            instance.setState({loginDisabled: false});
+            instance.handleError(err.message, "err");
           });
         }
       },
 
       handleLoginSuccessful: function(instance) {
-        instance.setState({errorText: ''});
+        instance.handleError("", null);
 
         // Logged in fine, subscribe to 'me' attaching callbacks from the contacts view.
         var me = Tinode.getMeTopic();
         me.onMetaDesc = instance.tnMeMetaDesc;
         instance.setState({sidePanelSelected: "contacts", myUserId: Tinode.getCurrentUserID()});
         // Subscribe, fetch topic desc, the list of subscriptions. Messages are not fetched.
-        me.subscribe(me.startMetaQuery().withLaterSub().withDesc().build());
+        me.subscribe(me.startMetaQuery().withLaterSub().withDesc().build()).catch(function(err){
+          instance.handleError(err.message, "err");
+        });
       },
 
       handleDisconnect: function(err) {
         this.setState({
-          sidePanelSelected: 'login',
-          sidePanelTitle: null,
-          sidePanelAvatar: null,
           dialogSelected: null,
-          myUserId: null,
-          errorText: err && err.message ? err.message : 'disconnected',
-          topicSelected: '',
+          errorText: err && err.message ? err.message : 'Disconnected',
+          errorLevel: err && err.message ? "err" : "warn",
           loginDisabled: false,
-          subscriptions: {},
-          showInfoPanel: false,
-          infoPanelShowMembers: false,
-          mobilePanel: 'sidepanel',
           contextMenuVisible: false,
           contextMenuBounds: null,
           contextMenuClickAt: null,
@@ -2907,11 +2942,14 @@
         var fnd = Tinode.getFndTopic();
         fnd.onSubsUpdated = this.tnFndSubsUpdated;
         fnd.onMetaDesc = this.tnFndMetaDesc;
+        var instance = this;
         if (fnd.isSubscribed()) {
           this.setState({contactsSearchQuery: fnd.private ? fnd.private.toString() : ''});
           this.tnFndSubsUpdated();
         } else {
-          fnd.subscribe(fnd.startMetaQuery().withSub().withLaterDesc().build());
+          fnd.subscribe(fnd.startMetaQuery().withSub().withLaterDesc().build()).catch(function(err){
+            instance.handleError(err.message, "err");
+          });
         }
       },
 
@@ -2933,10 +2971,13 @@
         @param query {Array} is an array of contacts to search for
        */
       handleSearchContacts: function(query) {
-          var fnd = Tinode.getFndTopic();
-          fnd.setMeta({desc: {private: query}}).then(function(ctrl) {
-            fnd.getMeta(fnd.startMetaQuery().withSub().withLaterDesc().build());
-          });
+        var fnd = Tinode.getFndTopic();
+        var instance = this;
+        fnd.setMeta({desc: {private: query}}).then(function(ctrl) {
+          fnd.getMeta(fnd.startMetaQuery().withSub().withLaterDesc().build());
+        }).catch(function(err){
+          instance.handleError(err.message, "err");
+        });
       },
 
       // User clicked on a contact in the side panel or deleted a contact.
@@ -2968,14 +3009,19 @@
       // User clicked on a message send button.
       handleSendMessage: function(msg) {
         var topic = Tinode.getTopic(this.state.topicSelected);
+        var instance = this;
         // Check if the message is formatted.
         var dft = Drafty.parse(msg);
         if (Drafty.isPlainText(dft)) {
           // The message is simple text. Sned if as text/plain.
-          topic.publish(msg);
+          topic.publish(msg).catch(function(err) {
+            instance.handleError(err.message, "err");
+          });;
         } else {
           // Formatted message. Send it as a Drafty object.
-          topic.publish(dft, undefined, Drafty.getContentType());
+          topic.publish(dft, undefined, Drafty.getContentType()).catch(function(err) {
+            instance.handleError(err.message, "err");
+          });
         }
       },
       // User chose a Sign Up menu item.
@@ -2990,21 +3036,24 @@
           .then(function() {
             return Tinode.createAccountBasic(login_, password_,
               {public: public_, private: private_, tags: tags_});
-          })
-          .then(function() {
+          }).then(function() {
             instance.handleLoginSuccessful(instance);
-          })
-          .catch(function(err) {
-            instance.setState({errorText: err.message});
+          }).catch(function(err) {
+            instance.handleError(err.message, "err");
           });
       },
 
       handleUpdateAccountRequest: function(password, pub, priv) {
+        var instance = this;
         if (pub || priv) {
-          Tinode.getMeTopic().setMeta({desc: {public: pub, private: priv}});
+          Tinode.getMeTopic().setMeta({desc: {public: pub, private: priv}}).catch(function(err) {
+            instance.handleError(err.message, "err");
+          });
         }
         if (password) {
-          Tinode.updateAccountBasic(null, Tinode.getCurrentLogin(), password);
+          Tinode.updateAccountBasic(null, Tinode.getCurrentLogin(), password).catch(function(err) {
+            instance.handleError(err.message, "err");
+          });
         }
       },
       // User chose Settings menu item.
@@ -3043,7 +3092,6 @@
 
         topic.subscribe(query.build(), setParams).then(function() {
           instance.setState({
-            errorText: '',
             topicSelected: topic.name,
             sidePanelSelected: 'contacts',
             mobilePanel: 'topic-view',
@@ -3051,11 +3099,12 @@
             infoPanelShowMembers: peerName ? false : true
           });
         }).catch(function(err) {
-          instance.setState({errorText: err.message});
+          instance.handleError(err.message, "err");
         });
       },
 
       handleTopicUpdateRequest: function(topicName, pub, priv, permissions) {
+        var instance = this;
         var topic = Tinode.getTopic(topicName);
         if (topic) {
           var params = {};
@@ -3068,11 +3117,14 @@
           if (permissions) {
             params.defacs = permissions;
           }
-          topic.setMeta({desc: params});
+          topic.setMeta({desc: params}).catch(function(err) {
+            instance.handleError(err.message, "err");
+          });
         }
       },
 
       handleChangePermissions: function(topicName, mode, uid) {
+        var instance = this;
         var topic = Tinode.getTopic(topicName);
         if (topic) {
           var am = topic.getAccessMode();
@@ -3083,7 +3135,9 @@
             am.updateWant(mode);
             mode = am.getWant();
           }
-          topic.setMeta({sub: {user: uid, mode: mode}});
+          topic.setMeta({sub: {user: uid, mode: mode}}).catch(function(err) {
+            instance.handleError(err.message, "err");
+          });
         }
       },
 
@@ -3100,6 +3154,8 @@
             showInfoPanel: false,
             infoPanelShowMembers: false
           });
+        }).catch(function(err) {
+          instance.handleError(err.message, "err");
         });
       },
 
@@ -3171,9 +3227,12 @@
           });
         }
 
+        var instance = this;
         if (removed && removed.length > 0) {
           removed.map(function(uid) {
-            topic.delSubscription(uid);
+            topic.delSubscription(uid).catch(function(err) {
+              instance.handleError(err.message, "err");
+            });;
           });
         }
       },
@@ -3194,11 +3253,12 @@
               user={this.state.contextMenuUser}
               items={this.state.contextMenuItems}
               hide={this.handleHideContextMenu}
-              onAction={this.handleContextMenuAction} />
+              onAction={this.handleContextMenuAction}
+              onError={this.handleError} />
 
             <SidepanelView
               displayMobile={this.state.displayMobile}
-              hideSelf={(this.state.displayMobile && this.state.mobilePanel !== 'sidepanel')}
+              hideSelf={this.state.displayMobile && this.state.mobilePanel !== 'sidepanel'}
               state={this.state.sidePanelSelected}
               title={this.state.sidePanelTitle}
               avatar={this.state.sidePanelAvatar}
@@ -3207,6 +3267,7 @@
               myUserId={this.state.myUserId}
               loginDisabled={this.state.loginDisabled}
               errorText={this.state.errorText}
+              errorLevel={this.state.errorLevel}
               topicSelected={this.state.topicSelected}
 
               serverAddress={this.state.serverAddress}
@@ -3230,7 +3291,6 @@
               showContextMenu={this.handleShowContextMenu} />
 
             <MessagesView
-              onHideMessagesView={this.handleHideMessagesView}
               displayMobile={this.state.displayMobile}
               hideSelf={(this.state.displayMobile &&
                 (this.state.mobilePanel !== 'topic-view' || this.state.showInfoPanel))}
@@ -3238,15 +3298,24 @@
               myUserId={this.state.myUserId}
               serverVersion={this.state.serverVersion}
               serverAddress={this.state.serverAddress}
+              errorText={this.state.errorText}
+              errorLevel={this.state.errorLevel}
+
+              onHideMessagesView={this.handleHideMessagesView}
               onData={this.tnData}
+              onError={this.handleError}
               showContextMenu={this.handleShowContextMenu}
               sendMessage={this.handleSendMessage} />
 
             {this.state.showInfoPanel ?
               <InfoView
+                displayMobile={this.state.displayMobile}
                 topic={this.state.topicSelected}
                 foundContacts={this.state.foundContacts}
                 myUserId={this.state.myUserId}
+                errorText={this.state.errorText}
+                errorLevel={this.state.errorLevel}
+
                 showMemberPanel={this.state.infoPanelShowMembers}
                 onTopicDescUpdate={this.handleTopicUpdateRequest}
                 onCancel={this.handleHideInfoView}