diff --git a/www/assert/main.js b/www/assert/main.js
index ad7883de3..3eb9e5892 100644
--- a/www/assert/main.js
+++ b/www/assert/main.js
@@ -237,6 +237,14 @@ define([
             !secret.hashData.present);
     }, "test support for trailing slashes in version 1 hash failed to parse");
 
+    assert(function (cb) {
+        var secret = Cryptpad.parsePadUrl('/invite/#/1/ilrOtygzDVoUSRpOOJrUuQ/e8jvf36S3chzkkcaMrLSW7PPrz7VDp85lIFNI26dTmr=/');
+        var hd = secret.hashData;
+        cb(hd.channel === "ilrOtygzDVoUSRpOOJrUuQ" &&
+            hd.pubkey === "e8jvf36S3chzkkcaMrLSW7PPrz7VDp85lIFNI26dTmr=" &&
+            hd.type === 'invite');
+    }, "test support for invite urls");
+
     assert(function (cb) {
         // TODO
         return cb(true);
@@ -278,7 +286,7 @@ define([
         // recreate a _mostly_ equivalent DOM
         var dom = Flat.toDOM(flat);
         // assume we don't care about comments
-        var bodyText = document.body.outerHTML.replace(/<!\-\-[\s\S]*?\-\->/g, '')
+        var bodyText = document.body.outerHTML.replace(/<!\-\-[\s\S]*?\-\->/g, '');
         // check for equality
         cb(dom.outerHTML === bodyText);
     });
diff --git a/www/common/common-interface.js b/www/common/common-interface.js
index 644efded2..f03b4b481 100644
--- a/www/common/common-interface.js
+++ b/www/common/common-interface.js
@@ -526,7 +526,8 @@ define([
         // them.
         var win;
         $('.tippy-popper').each(function (i, el) {
-            win = win || $('#pad-iframe')[0].contentWindow;
+            win = win || $('#pad-iframe').length? $('#pad-iframe')[0].contentWindow: undefined;
+            if (!win) { return; }
             if (win.$('[aria-describedby=' + el.getAttribute('id') + ']').length === 0) {
                 el.remove();
             }
diff --git a/www/common/common-thumbnail.js b/www/common/common-thumbnail.js
index 2ab07cb75..fb7edafc4 100644
--- a/www/common/common-thumbnail.js
+++ b/www/common/common-thumbnail.js
@@ -4,7 +4,8 @@ define([
     var Nacl = window.nacl;
     var Thumb = {
         dimension: 100,
-        padDimension: 200
+        padDimension: 200,
+        UPDATE_INTERVAL: 5000
     };
 
     var supportedTypes = [
@@ -43,7 +44,7 @@ define([
         }
     };
 
-    var getResizedDimensions = function (img, type) {
+    var getResizedDimensions = Thumb.getResizedDimensions = function (img, type) {
         var h = type === 'video' ? img.videoHeight : img.height;
         var w = type === 'video' ? img.videoWidth : img.width;
 
diff --git a/www/common/sframe-app-framework.js b/www/common/sframe-app-framework.js
index b6dfb6e58..87ba6ee2c 100644
--- a/www/common/sframe-app-framework.js
+++ b/www/common/sframe-app-framework.js
@@ -285,7 +285,7 @@ define([
                         SFUI.setPadThumbnail(href, b64);
                     });
                 };
-                window.setInterval(mkThumbnail, 5000);
+                window.setInterval(mkThumbnail, Thumb.UPDATE_INTERVAL);
             }
 
             if (newPad) {
diff --git a/www/common/toolbar3.js b/www/common/toolbar3.js
index 29d78e91c..be8e6399f 100644
--- a/www/common/toolbar3.js
+++ b/www/common/toolbar3.js
@@ -921,6 +921,7 @@ define([
                 return count;
             };
 
+            var joined = false;
             metadataMgr.onChange(function () {
                 var newdata = metadataMgr.getMetadata().users;
                 var netfluxIds = Object.keys(newdata);
@@ -949,7 +950,7 @@ define([
                     return;
                 }
                 for (var k in newdata) {
-                    if (k !== userNetfluxId && netfluxIds.indexOf(k) !== -1) {
+                    if (joined && k !== userNetfluxId && netfluxIds.indexOf(k) !== -1) {
                         if (typeof oldUserData[k] === "undefined") {
                             // if the same uid is already present in the userdata, don't notify
                             if (!userPresent(k, newdata[k], oldUserData)) {
@@ -960,6 +961,7 @@ define([
                         }
                     }
                 }
+                joined = true;
                 oldUserData = JSON.parse(JSON.stringify(newdata));
             });
         }
diff --git a/www/poll/inner.js b/www/poll/inner.js
index eb62cddcd..3f66a965d 100644
--- a/www/poll/inner.js
+++ b/www/poll/inner.js
@@ -14,6 +14,8 @@ define([
     '/poll/render.js',
     '/common/diffMarked.js',
     '/common/sframe-common-codemirror.js',
+    '/common/sframe-common-interface.js',
+    '/common/common-thumbnail.js',
 
     'cm/lib/codemirror',
     'cm/addon/display/placeholder',
@@ -41,6 +43,8 @@ define([
     Renderer,
     DiffMd,
     SframeCM,
+    SFUI,
+    Thumb,
     CMeditor)
 {
     var Messages = Cryptpad.Messages;
@@ -790,6 +794,51 @@ define([
         updateComments();
     };
 
+    var initThumbnails = function () {
+        var oldThumbnailState;
+        var privateDat = metadataMgr.getPrivateData();
+        var hash = privateDat.availableHashes.editHash ||
+                   privateDat.availableHashes.viewHash;
+        var href = privateDat.pathname + '#' + hash;
+        var $el = $('.cp-app-poll-realtime');
+        //var $el = $('#cp-app-poll-table');
+        var options = {
+            getContainer: function () { return $el[0]; },
+            filter: function (el, before) {
+                if (before) {
+                    $el.parents().css('overflow', 'visible');
+                    $el.css('max-height', Math.max(600, $(el).width()) + 'px');
+                    $el.find('tr td:first-child, tr td:last-child, tr td:nth-last-child(2)')
+                        .css('position', 'static');
+                    $el.find('#cp-app-poll-comments').css('display', 'none');
+                    $el.find('#cp-app-poll-table-container').css('text-align', 'center');
+                    $el.find('#cp-app-poll-table-scroll').css('margin', 'auto');
+                    $el.find('#cp-app-poll-table-scroll').css('max-width', '100%');
+                    return;
+                }
+                $el.parents().css('overflow', '');
+                $el.css('max-height', '');
+                $el.find('#cp-app-poll-comments').css('display', '');
+                $el.find('#cp-app-poll-table-container').css('text-align', '');
+                $el.find('#cp-app-poll-table-scroll').css('margin', '');
+                $el.find('#cp-app-poll-table-scroll').css('max-width', '');
+                $el.find('tr td:first-child, tr td:last-child, tr td:nth-last-child(2)')
+                    .css('position', '');
+            }
+        };
+        var mkThumbnail = function () {
+            if (!hash) { return; }
+            if (!APP.proxy) { return; }
+            var content = JSON.stringify(APP.proxy.content);
+            if (content === oldThumbnailState) { return; }
+            Thumb.fromDOM(options, function (err, b64) {
+                oldThumbnailState = content;
+                SFUI.setPadThumbnail(href, b64);
+            });
+        };
+        window.setInterval(mkThumbnail, Thumb.UPDATE_INTERVAL);
+    };
+
     var checkDeletedCells = function () {
         // faster than forEach?
         var c;
@@ -938,6 +987,7 @@ define([
         var $table = APP.$table = $('#cp-app-poll-table-scroll').find('table');
         updateDisplayedTable();
         updateDescription(null, APP.proxy.description || '');
+        initThumbnails();
 
         // Initialize author name for comments.
         // Disable name modification for logged in users
diff --git a/www/whiteboard/inner.js b/www/whiteboard/inner.js
index 626ad1a90..efa45233e 100644
--- a/www/whiteboard/inner.js
+++ b/www/whiteboard/inner.js
@@ -10,6 +10,7 @@ define([
     '/common/cryptget.js',
     '/bower_components/nthen/index.js',
     '/common/sframe-common.js',
+    '/common/sframe-common-interface.js',
     '/api/config',
     '/common/common-realtime.js',
     '/customize/pages.js',
@@ -36,6 +37,7 @@ define([
     Cryptget,
     nThen,
     SFCommon,
+    SFUI,
     ApiConfig,
     CommonRealtime,
     Pages,
@@ -372,6 +374,27 @@ define([
             onLocal();
         };
 
+        var initThumbnails = function () {
+            var oldThumbnailState;
+            var privateDat = metadataMgr.getPrivateData();
+            var hash = privateDat.availableHashes.editHash ||
+                       privateDat.availableHashes.viewHash;
+            var href = privateDat.pathname + '#' + hash;
+            var mkThumbnail = function () {
+                if (!hash) { return; }
+                if (initializing) { return; }
+                if (!APP.realtime) { return; }
+                var content = APP.realtime.getUserDoc();
+                if (content === oldThumbnailState) { return; }
+                var D = Thumb.getResizedDimensions($canvas[0], 'pad');
+                Thumb.fromCanvas($canvas[0], D, function (err, b64) {
+                    oldThumbnailState = content;
+                    SFUI.setPadThumbnail(href, b64);
+                });
+            };
+            window.setInterval(mkThumbnail, Thumb.UPDATE_INTERVAL);
+        };
+
         config.onInit = function (info) {
             updateLocalPalette(palette);
             readOnly = metadataMgr.getPrivateData().readOnly;
@@ -532,6 +555,10 @@ define([
                 initializing = false;
                 config.onLocal();
                 Cryptpad.removeLoadingScreen();
+
+                initThumbnails();
+
+
                 if (readOnly) { return; }
                 if (isNew) {
                     common.openTemplatePicker();