fixed #2670

public/src/client/chats.js

@@ -18,10 +18,13 @@ define('forum/chats', ['string', 'sounds', 'forum/infinitescroll'], function(S,
 		}
 
 		Chats.addEventListeners();
-		Chats.resizeMainWindow();
-		Chats.scrollToBottom(containerEl);
 		Chats.setActive();
 
+		$(window).on('action:ajaxify.end', function() {
+			Chats.resizeMainWindow();
+			Chats.scrollToBottom(containerEl);
+		});
+
 		Chats.initialised = true;
 	};