Safari sometimes screws up the scroll bar on the side of the window. The normal scroll bar is sometimes displayed on top of a non-functional cut-off scrollbar, which is lower than the working scroll bar. If I click and drag to scroll through the contents of the window, it works fine, but if I try to use the arrow keys (which is what I usually do) the screen doesn't move.
A picture of what I am attempting to descibe can be seen at
http://mahi.ucsd.edu/rbulow/PICS/safari_grab.jpg
This does not seem to occur regularly or in a predictable way. It does seem to happen frequently on the TV guide website, which has embedded scroll-bars, but not always, and not exclusively.
Any suggestions?