Arn,
I would love to do a screenshot, but I'm at work and I'm not too good with windows. I don't know how to take a screenshot.
But to answer the question at hand, it seems when I jump to a thread (i.e. via the e-mail notification) the posts are centered. The page is still bigger than the window, but the posts are centered. When I choose a thread from the a forum, the page is the same size, but the window is scrolled to the left, so I have to manually scroll to the right.
It's really wierd. I wonder if anyone else has this problem?