For me, the scrollbar on the side
is for the threadlist - I don't get the messages one until I resize it enough to make it fit.
I think I've narrowed it down to URLs containing "/advert/", which makes me wonder if it's something to do with AdBlock Plus.
And...Yep. If I disable ABP for tehforum.co.uk, it doesn't happen.
EDITED: 13 May 2011 17:50 by BOUGHTONP