diff --git a/apps/common/main/lib/controller/HintManager.js b/apps/common/main/lib/controller/HintManager.js
index ee2dd42f2..fa6fdb12d 100644
--- a/apps/common/main/lib/controller/HintManager.js
+++ b/apps/common/main/lib/controller/HintManager.js
@@ -492,7 +492,9 @@ Common.UI.HintManager = new(function() {
                         match = false;
                     var keyCode = e.keyCode;
                     if (keyCode !== 16 && keyCode !== 17 && keyCode !== 18 && keyCode !== 91) {
-                        curLetter = _lang === 'en' ? ((keyCode > 47 && keyCode < 58 || keyCode > 64 && keyCode < 91) ? String.fromCharCode(e.keyCode) : null) : e.key;
+                        curLetter = _lang === 'en' ?
+                            ((keyCode > 47 && keyCode < 58 || keyCode > 64 && keyCode < 91) ? String.fromCharCode(e.keyCode) : null) :
+                            (/[.*+?^${}()|[\]\\]/g.test(e.key) ? null : e.key);
                     }
                     if (curLetter) {
                         var curr;
diff --git a/apps/common/main/lib/view/About.js b/apps/common/main/lib/view/About.js
index e588215ae..04f3530eb 100644
--- a/apps/common/main/lib/view/About.js
+++ b/apps/common/main/lib/view/About.js
@@ -235,10 +235,10 @@ define([
                         this.lblCompanyLic.parents('tr').addClass('hidden');
 
                     value = Common.UI.Themes.isDarkTheme() ? (customer.logoDark || customer.logo) : (customer.logo || customer.logoDark);
-                    value.length ?
+                    value && value.length ?
                         this.divCompanyLogo.html('<img src="'+value+'" style="max-width:216px; max-height: 35px;" />') :
                         this.divCompanyLogo.parents('tr').addClass('hidden');
-                    value.length && Common.NotificationCenter.on('uitheme:changed', this.changeLogo.bind(this));
+                    value && value.length && Common.NotificationCenter.on('uitheme:changed', this.changeLogo.bind(this));
                 } else {
                     this.cntLicenseeInfo.addClass('hidden');
                     this.cntLicensorInfo.addClass('margin-bottom');
diff --git a/apps/documenteditor/forms/app/controller/ApplicationController.js b/apps/documenteditor/forms/app/controller/ApplicationController.js
index a898d25be..45947fc43 100644
--- a/apps/documenteditor/forms/app/controller/ApplicationController.js
+++ b/apps/documenteditor/forms/app/controller/ApplicationController.js
@@ -104,6 +104,8 @@ define([
                 this.api.asc_registerCallback('asc_onCurrentPage',           this.onCurrentPage.bind(this));
                 this.api.asc_registerCallback('asc_onDocumentModifiedChanged', _.bind(this.onDocumentModifiedChanged, this));
                 this.api.asc_registerCallback('asc_onZoomChange',           this.onApiZoomChange.bind(this));
+                this.api.asc_registerCallback('asc_onCoAuthoringDisconnect', _.bind(this.onApiServerDisconnect, this));
+                Common.NotificationCenter.on('api:disconnect',               _.bind(this.onApiServerDisconnect, this));
 
                 // Initialize api gateway
                 Common.Gateway.on('init',               this.loadConfig.bind(this));
@@ -678,7 +680,7 @@ define([
                 }
 
                 if (this._state.licenseType!==Asc.c_oLicenseResult.SuccessLimit && this.appOptions.canFillForms) {
-                    this.disableEditing(true);
+                    Common.NotificationCenter.trigger('api:disconnect');
                 }
 
                 var value = Common.localStorage.getItem("de-license-warning");
@@ -1811,9 +1813,21 @@ define([
             }
         },
 
-        disableEditing: function(state) {
-            this.view && this.view.btnClear && this.view.btnClear.setDisabled(state);
-            this._isDisabled = state;
+        onApiServerDisconnect: function(enableDownload) {
+            this._state.isDisconnected = true;
+            this._isDisabled = true;
+            this.view && this.view.btnClear && this.view.btnClear.setDisabled(true);
+            if (!enableDownload) {
+                this.appOptions.canPrint = this.appOptions.canDownload = false;
+                this.view && this.view.btnDownload.setDisabled(true);
+                this.view && this.view.btnSubmit.setDisabled(true);
+                if (this.view && this.view.btnOptions && this.view.btnOptions.menu) {
+                    this.view.btnOptions.menu.items[0].setDisabled(true); // print
+                    this.view.btnOptions.menu.items[2].setDisabled(true); // download
+                    this.view.btnOptions.menu.items[3].setDisabled(true); // download docx
+                    this.view.btnOptions.menu.items[4].setDisabled(true); // download pdf
+                }
+            }
         },
 
         errorDefaultMessage     : 'Error code: %1',
diff --git a/apps/documenteditor/mobile/src/store/textSettings.js b/apps/documenteditor/mobile/src/store/textSettings.js
index c5526df34..b3c50936d 100644
--- a/apps/documenteditor/mobile/src/store/textSettings.js
+++ b/apps/documenteditor/mobile/src/store/textSettings.js
@@ -101,11 +101,11 @@ export class storeTextSettings {
         this.thumbCanvas = document.createElement('canvas');
         this.thumbContext = this.thumbCanvas.getContext('2d');
         this.thumbs = [
-            {ratio: 1, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail.png', width: this.iconWidth, height: this.iconHeight},
-            {ratio: 1.25, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@1.25x.png', width: this.iconWidth * 1.25, height: this.iconHeight * 1.25},
-            {ratio: 1.5, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@1.5x.png', width: this.iconWidth * 1.5, height: this.iconHeight * 1.5},
-            {ratio: 1.75, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@1.75x.png', width: this.iconWidth * 1.75, height: this.iconHeight * 1.75},
-            {ratio: 2, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@2x.png', width: this.iconWidth * 2, height: this.iconHeight * 2}
+            {ratio: 1, path: '../../../../../sdkjs/common/Images/fonts_thumbnail.png', width: this.iconWidth, height: this.iconHeight},
+            {ratio: 1.25, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@1.25x.png', width: this.iconWidth * 1.25, height: this.iconHeight * 1.25},
+            {ratio: 1.5, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@1.5x.png', width: this.iconWidth * 1.5, height: this.iconHeight * 1.5},
+            {ratio: 1.75, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@1.75x.png', width: this.iconWidth * 1.75, height: this.iconHeight * 1.75},
+            {ratio: 2, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@2x.png', width: this.iconWidth * 2, height: this.iconHeight * 2}
         ];
 
         const applicationPixelRatio = Common.Utils.applicationPixelRatio();
diff --git a/apps/presentationeditor/mobile/src/store/textSettings.js b/apps/presentationeditor/mobile/src/store/textSettings.js
index 44ae68c56..551c633ae 100644
--- a/apps/presentationeditor/mobile/src/store/textSettings.js
+++ b/apps/presentationeditor/mobile/src/store/textSettings.js
@@ -105,11 +105,11 @@ export class storeTextSettings {
         this.thumbCanvas = document.createElement('canvas');
         this.thumbContext = this.thumbCanvas.getContext('2d');
         this.thumbs = [
-            {ratio: 1, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail.png', width: this.iconWidth, height: this.iconHeight},
-            {ratio: 1.25, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@1.25x.png', width: this.iconWidth * 1.25, height: this.iconHeight * 1.25},
-            {ratio: 1.5, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@1.5x.png', width: this.iconWidth * 1.5, height: this.iconHeight * 1.5},
-            {ratio: 1.75, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@1.75x.png', width: this.iconWidth * 1.75, height: this.iconHeight * 1.75},
-            {ratio: 2, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@2x.png', width: this.iconWidth * 2, height: this.iconHeight * 2}
+            {ratio: 1, path: '../../../../../sdkjs/common/Images/fonts_thumbnail.png', width: this.iconWidth, height: this.iconHeight},
+            {ratio: 1.25, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@1.25x.png', width: this.iconWidth * 1.25, height: this.iconHeight * 1.25},
+            {ratio: 1.5, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@1.5x.png', width: this.iconWidth * 1.5, height: this.iconHeight * 1.5},
+            {ratio: 1.75, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@1.75x.png', width: this.iconWidth * 1.75, height: this.iconHeight * 1.75},
+            {ratio: 2, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@2x.png', width: this.iconWidth * 2, height: this.iconHeight * 2}
         ];
 
         const applicationPixelRatio = Common.Utils.applicationPixelRatio();
diff --git a/apps/spreadsheeteditor/mobile/src/store/textSettings.js b/apps/spreadsheeteditor/mobile/src/store/textSettings.js
index 9b57d4350..b034ad03f 100644
--- a/apps/spreadsheeteditor/mobile/src/store/textSettings.js
+++ b/apps/spreadsheeteditor/mobile/src/store/textSettings.js
@@ -105,11 +105,11 @@ export class storeTextSettings {
         this.thumbCanvas = document.createElement('canvas');
         this.thumbContext = this.thumbCanvas.getContext('2d');
         this.thumbs = [
-            {ratio: 1, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail.png', width: this.iconWidth, height: this.iconHeight},
-            {ratio: 1.25, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@1.25x.png', width: this.iconWidth * 1.25, height: this.iconHeight * 1.25},
-            {ratio: 1.5, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@1.5x.png', width: this.iconWidth * 1.5, height: this.iconHeight * 1.5},
-            {ratio: 1.75, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@1.75x.png', width: this.iconWidth * 1.75, height: this.iconHeight * 1.75},
-            {ratio: 2, path: '../../../../../../../sdkjs/common/Images/fonts_thumbnail@2x.png', width: this.iconWidth * 2, height: this.iconHeight * 2}
+            {ratio: 1, path: '../../../../../sdkjs/common/Images/fonts_thumbnail.png', width: this.iconWidth, height: this.iconHeight},
+            {ratio: 1.25, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@1.25x.png', width: this.iconWidth * 1.25, height: this.iconHeight * 1.25},
+            {ratio: 1.5, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@1.5x.png', width: this.iconWidth * 1.5, height: this.iconHeight * 1.5},
+            {ratio: 1.75, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@1.75x.png', width: this.iconWidth * 1.75, height: this.iconHeight * 1.75},
+            {ratio: 2, path: '../../../../../sdkjs/common/Images/fonts_thumbnail@2x.png', width: this.iconWidth * 2, height: this.iconHeight * 2}
         ];
 
         const applicationPixelRatio = Common.Utils.applicationPixelRatio();