Not sure if this happend since the vB 3.5 upgrade but I'm always getting a useless horizontal scroll bar that lets me scroll all pages 50% to the right to see nothing but white.
Looks like a Firefox bug. I saw the same thing happening with Firefox 1.0.1 on Windows. Upgraded it to 1.0.4 and it went away.
It seems to happen when you resize the window. I just resize then get the scrollbar which does go away if I view another thread, odd!
Me, too... it's slow, clunky, and erratic. And the hype about increased security is just that... hype.