The post sequence on the main page refreshing/reshuffling whenever you hit the back button! Why can't it just stay still so I can go through all the posts I want to read in succession? So often when I hit the back button I can no longer find the post I wanted to read next!
Even worse when the page updates as you try to open a thread so you open the wrong thread and then can't find the one you were looking for when you go back.