UserTracking object is locked now to prevent concurrency issues we were having

InABox.Database/Stores/Store.cs

@@ -100,7 +100,10 @@ namespace InABox.Database
                 UserTrackingCache.Cache.Add(tracking);
             }
 
-            tracking.Increment(DateTime.Now, action);
+            lock (tracking)
+            {
+                tracking.Increment(DateTime.Now, action);
+            }
             Provider.Save(tracking);
         }