diff --git a/lib/historyKeeper.js b/lib/historyKeeper.js
index aa320f4b6..7e45faf08 100644
--- a/lib/historyKeeper.js
+++ b/lib/historyKeeper.js
@@ -38,6 +38,7 @@ module.exports.create = function (config, cb) {
         channel_cache: {},
         queueStorage: WriteQueue(),
         queueDeletes: WriteQueue(),
+        queueValidation: WriteQueue(),
 
         batchIndexReads: BatchRead("HK_GET_INDEX"),
         batchMetadata: BatchRead('GET_METADATA'),
diff --git a/lib/hk-util.js b/lib/hk-util.js
index 562114ec7..81984b300 100644
--- a/lib/hk-util.js
+++ b/lib/hk-util.js
@@ -859,23 +859,30 @@ HK.onChannelMessage = function (Env, Server, channel, msgStruct) {
 
         // trim the checkpoint indicator off the message if it's present
         let signedMsg = (isCp) ? msgStruct[4].replace(CHECKPOINT_PATTERN, '') : msgStruct[4];
-        // convert the message from a base64 string into a Uint8Array
-
-        //const txid = Util.uid();
 
         // Listen for messages
-        //console.log(+new Date(), "Send verification request");
-        Env.validateMessage(signedMsg, metadata.validateKey, w(function (err) {
-            // no errors means success
-            if (!err) { return; }
-            // validation can fail in multiple ways
-            if (err === 'FAILED') {
-                // we log this case, but not others for some reason
-                Log.info("HK_SIGNED_MESSAGE_REJECTED", 'Channel '+channel.id);
-            }
-            // always abort if there was an error...
-            return void w.abort();
-        }));
+        /*  queueing this helps avoid race conditions in which workers
+            validate and write messages in a different order than they were received.
+            For best effect the validate and store should actually be queued atomically,
+            but this is a step in the right direction.
+        */
+        var proceed = w();
+        Env.queueValidation(channel.id, function (next) {
+            Env.validateMessage(signedMsg, metadata.validateKey, function (err) {
+                // always go on to the next item in the queue regardless of the outcome
+                next();
+
+                // no errors means success
+                if (!err) { return proceed(); }
+                // validation can fail in multiple ways
+                if (err === 'FAILED') {
+                    // we log this case, but not others for some reason
+                    Log.info("HK_SIGNED_MESSAGE_REJECTED", 'Channel '+channel.id);
+                }
+                // always abort if there was an error...
+                return void w.abort();
+            });
+        });
     }).nThen(function () {
         // do checkpoint stuff...
 
diff --git a/lib/log.js b/lib/log.js
index 386ee6b41..a815500b0 100644
--- a/lib/log.js
+++ b/lib/log.js
@@ -28,7 +28,7 @@ var handlers = {};
     handlers[level] = function (ctx, content) { console.log(content); };
 });
 ['warn', 'error'].forEach(function (level) {
-    handlers[level] = function (ctx, content) { console.error(content); }
+    handlers[level] = function (ctx, content) { console.error(content); };
 });
 
 var noop = function () {};
diff --git a/lib/workers/index.js b/lib/workers/index.js
index 911b34337..6858dffb5 100644
--- a/lib/workers/index.js
+++ b/lib/workers/index.js
@@ -8,7 +8,7 @@ const Workers = module.exports;
 const PID = process.pid;
 
 const DB_PATH = 'lib/workers/db-worker';
-const MAX_JOBS = 16;
+const MAX_JOBS = 8;
 
 Workers.initialize = function (Env, config, _cb) {
     var cb = Util.once(Util.mkAsync(_cb));
@@ -97,7 +97,7 @@ Workers.initialize = function (Env, config, _cb) {
         // track which worker is doing which jobs
         state.tasks[txid] = msg;
 
-        response.expect(txid, cb, 60000);
+        response.expect(txid, cb, 180000);
         state.worker.send(msg);
     };
 
diff --git a/www/admin/app-admin.less b/www/admin/app-admin.less
index 84532c6c5..96d89b44b 100644
--- a/www/admin/app-admin.less
+++ b/www/admin/app-admin.less
@@ -32,9 +32,18 @@
         .cp-support-list-message {
             &:last-child:not(.cp-support-fromadmin)  {
                 color: @colortheme_cp-red;
-                background-color: lighten(@colortheme_cp-red, 25%);
+                background-color: lighten(@colortheme_form-warning, 25%);
                 .cp-support-showdata {
-                    background-color: lighten(@colortheme_cp-red, 30%);
+                    background-color: lighten(@colortheme_form-warning, 30%);
+                }
+            }
+
+            &:last-child {
+                &.cp-support-frompremium {
+                    background-color: lighten(@colortheme_cp-red, 25%);
+                    .cp-support-showdata {
+                        background-color: lighten(@colortheme_cp-red, 30%);
+                    }
                 }
             }
         }
diff --git a/www/common/diffMarked.js b/www/common/diffMarked.js
index fc9c4046c..48f800075 100644
--- a/www/common/diffMarked.js
+++ b/www/common/diffMarked.js
@@ -23,7 +23,7 @@ define([
         init: function () {}
     };
 
-    var mermaidThemeCSS = ".node rect { fill: #DDD; stroke: #AAA; } " +
+    var mermaidThemeCSS = //".node rect { fill: #DDD; stroke: #AAA; } " +
         "rect.task, rect.task0, rect.task2 { stroke-width: 1 !important; rx: 0 !important; } " +
         "g.grid g.tick line { opacity: 0.25; }" +
         "g.today line { stroke: red; stroke-width: 1; stroke-dasharray: 3; opacity: 0.5; }";
diff --git a/www/support/ui.js b/www/support/ui.js
index 2038d8ddd..ba6ae9967 100644
--- a/www/support/ui.js
+++ b/www/support/ui.js
@@ -188,6 +188,7 @@ define([
         var senderKey = content.sender && content.sender.edPublic;
         var fromMe = senderKey === privateData.edPublic;
         var fromAdmin = ctx.adminKeys.indexOf(senderKey) !== -1;
+        var fromPremium = Boolean(content.sender.plan);
 
         var userData = h('div.cp-support-showdata', [
             Messages.support_showData,
@@ -199,8 +200,10 @@ define([
             ev.stopPropagation();
         });
 
+        var adminClass = (fromAdmin? '.cp-support-fromadmin': '');
+        var premiumClass = (fromPremium && !fromAdmin? '.cp-support-frompremium': '');
         var name = Util.fixHTML(content.sender.name) || Messages.anonymous;
-        return h('div.cp-support-list-message' + (fromAdmin? '.cp-support-fromadmin': ''), {
+        return h('div.cp-support-list-message' + adminClass + premiumClass, {
             'data-hash': hash
         }, [
             h('div.cp-support-message-from' + (fromMe ? '.cp-support-fromme' : ''), [