This has been broken for me in long threads since the new FT.
I got some pictures below. They are taken from the Official Wii thread, on page 2.
Cuts off randomly
all the way to bottom
This happens on just about every long thread, but sometimes only on some of the pages. Page 1 of that Wii thread was fine. I have the number of posts/messages per page set to 120. It might be something to do with these new options... it might not happen when set at old max of 100, but not confirmed.
Windows XP Pro SP2, Firefox 2.0.0.4
Also, I use the All-in-one mouse gestures extension. When the page cuts off like in that picture, when I "draw" a mouse gesture, it does not appear on the cut off/messed up white part, even though it is actually drawing. It doesn't prevent the gesture from working, just I can't see what I drew like I can on just about any other webpage (except Flash and some others). So maybe that might be a clue on what exactly is being drawn in that white space instead of the rest of the thread.
I would give you some links, but as I said it is basically any long thread with > 1 page. Quick examples:
Off-topic:
AnandTech Off-Topic Member Gallery
Official Wii thread part 2
Networking thread
Cycling for a cause
Video:
In House HD2900XT vs. 8800GTS 640
LCD thread
Basically EVERY long thread does it, mostly on ever page of those long threads. They all look exactly the same as the two pictures I linked.