diff --git a/lib/hk-util.js b/lib/hk-util.js
index 799ec547f..40a43ddbc 100644
--- a/lib/hk-util.js
+++ b/lib/hk-util.js
@@ -325,7 +325,7 @@ const storeMessage = function (Env, channel, msg, isCp, optionalMessageHash) {
       * it has a side-effect of filling the index cache if it's empty
     1. if you provided a lastKnownHash and that message does not exist in the history:
       * either the client has made a mistake or the history they knew about no longer exists
-      * call back with EINVAL
+      * call back with EUNKNOWN
     2. if you did not provide a lastKnownHash
       * and there are fewer than two checkpoints:
         * return 0 (read from the start of the file)
@@ -360,7 +360,7 @@ const getHistoryOffset = (Env, channelName, lastKnownHash, _cb) => {
             // QUESTION: does this mean mailboxes are causing the server to store too much stuff in memory?
             if (lastKnownHash && typeof(lkh) !== "number") {
                 waitFor.abort();
-                return void cb(new Error('EINVAL'));
+                return void cb(new Error('EUNKNOWN'));
             }
 
             // Since last 2 checkpoints
diff --git a/www/common/outer/async-store.js b/www/common/outer/async-store.js
index 2a2fcaacf..4fe64aad7 100644
--- a/www/common/outer/async-store.js
+++ b/www/common/outer/async-store.js
@@ -1499,6 +1499,13 @@ define([
 
                 return;
             }
+            var onError = function (err) {
+                channel.bcast("PAD_ERROR", err);
+
+                // If this is a DELETED, EXPIRED or RESTRICTED pad, leave the channel
+                if (["EDELETED", "EEXPIRED", "ERESTRICTED"].indexOf(err.type) === -1) { return; }
+                Store.leavePad(null, data, function () {});
+            };
             var conf = {
                 onReady: function (pad) {
                     var padData = pad.metadata || {};
@@ -1522,14 +1529,8 @@ define([
                 onLeave: function (m) {
                     channel.bcast("PAD_LEAVE", m);
                 },
-                onError: function (err) {
-                    channel.bcast("PAD_ERROR", err);
-                    Store.leavePad(null, data, function () {});
-                },
-                onChannelError: function (err) {
-                    channel.bcast("PAD_ERROR", err);
-                    Store.leavePad(null, data, function () {});
-                },
+                onError: onError,
+                onChannelError: onError,
                 onRejected: function (allowed, _cb) {
                     var cb = Util.once(Util.mkAsync(_cb));
 
diff --git a/www/common/sframe-app-framework.js b/www/common/sframe-app-framework.js
index a72d69f1a..a90877ff1 100644
--- a/www/common/sframe-app-framework.js
+++ b/www/common/sframe-app-framework.js
@@ -325,6 +325,11 @@ define([
 
             UI.updateLoadingProgress({ state: -1 }, false);
 
+            if (toolbar) {
+                // Check if we have a new chainpad instance
+                toolbar.resetChainpad(cpNfInner.chainpad);
+            }
+
             var newPad = false;
             if (newContentStr === '') { newPad = true; }
 
@@ -364,6 +369,9 @@ define([
             }).nThen(function () {
                 stateChange(STATE.READY);
                 firstConnection = false;
+
+                oldContent = undefined;
+
                 if (!readOnly) { onLocal(); }
                 evOnReady.fire(newPad);
 
diff --git a/www/common/sframe-chainpad-netflux-inner.js b/www/common/sframe-chainpad-netflux-inner.js
index 65feb67da..a55463bb7 100644
--- a/www/common/sframe-chainpad-netflux-inner.js
+++ b/www/common/sframe-chainpad-netflux-inner.js
@@ -49,24 +49,29 @@ define([
         config = undefined;
 
         var evPatchSent = Util.mkEvent();
+        var chainpad;
 
-        var chainpad = ChainPad.create({
-            userName: userName,
-            initialState: initialState,
-            patchTransformer: patchTransformer,
-            validateContent: validateContent,
-            avgSyncMilliseconds: avgSyncMilliseconds,
-            logLevel: logLevel
-        });
-        chainpad.onMessage(function(message, cb) {
-            sframeChan.query('Q_RT_MESSAGE', message, function (err) {
-                if (!err) { evPatchSent.fire(); }
-                cb(err);
+        var makeChainPad = function () {
+            var _chainpad = ChainPad.create({
+                userName: userName,
+                initialState: initialState,
+                patchTransformer: patchTransformer,
+                validateContent: validateContent,
+                avgSyncMilliseconds: avgSyncMilliseconds,
+                logLevel: logLevel
             });
-        });
-        chainpad.onPatch(function () {
-            onRemote({ realtime: chainpad });
-        });
+            _chainpad.onMessage(function(message, cb) {
+                sframeChan.query('Q_RT_MESSAGE', message, function (err) {
+                    if (!err) { evPatchSent.fire(); }
+                    cb(err);
+                });
+            });
+            _chainpad.onPatch(function () {
+                onRemote({ realtime: chainpad });
+            });
+            return _chainpad;
+        };
+        chainpad = makeChainPad();
 
         var myID;
         var isReady = false;
@@ -96,6 +101,11 @@ define([
         sframeChan.on('EV_RT_ERROR', function (err) {
             isReady = false;
             chainpad.abort();
+            if (err.type === 'EUNKNOWN') { // XXX
+                // Recoverable error: make a new chainpad
+                chainpad = makeChainPad();
+                return;
+            }
             onError(err);
         });
         sframeChan.on('EV_RT_CONNECT', function (content) {
@@ -149,15 +159,18 @@ define([
             });
         };
 
-        return Object.freeze({
+        var cpNfInner = {
             getMyID: function () { return myID; },
             metadataMgr: metadataMgr,
             whenRealtimeSyncs: whenRealtimeSyncs,
             onInfiniteSpinner: evInfiniteSpinner.reg,
             onPatchSent: evPatchSent.reg,
             offPatchSent: evPatchSent.unreg,
-            chainpad: chainpad,
+        };
+        cpNfInner.__defineGetter__("chainpad", function () {
+            return chainpad;
         });
+        return Object.freeze(cpNfInner);
     };
     return Object.freeze(module.exports);
 });
diff --git a/www/common/toolbar3.js b/www/common/toolbar3.js
index 34ac97310..13f7b9f50 100644
--- a/www/common/toolbar3.js
+++ b/www/common/toolbar3.js
@@ -1331,6 +1331,15 @@ MessengerUI, Messages) {
             showColors = true;
         };
 
+        // If we had to create a new chainpad instance, reset the one used in the toolbar
+        toolbar.resetChainpad = function (chainpad) {
+            if (config.realtime !== chainpad) {
+                config.realtime = chainpad;
+                config.realtime.onPatch(ks(toolbar, config));
+                config.realtime.onMessage(ks(toolbar, config, true));
+            }
+        };
+
         // On log out, remove permanently the realtime elements of the toolbar
         Common.onLogout(function () {
             failed();
diff --git a/www/poll/inner.js b/www/poll/inner.js
index 6c8e77482..38ed1b79c 100644
--- a/www/poll/inner.js
+++ b/www/poll/inner.js
@@ -794,6 +794,11 @@ define([
         var userDoc = JSON.stringify(proxy);
         if (userDoc === "" || userDoc === "{}") { isNew = true; }
 
+        if (APP.toolbar && APP.rt.cpCnInner) {
+            // Check if we have a new chainpad instance
+            APP.toolbar.resetChainpad(APP.rt.cpCnInner.chainpad);
+        }
+
         if (!isNew) {
             if (proxy.info) {
                 // Migration