Ever since I updated to IE 7, I've had the same problem on the Chronicle BB, and nowhere else. It's been driving me nuts (though at least I had gotten over thinking there was something wrong with my mouse settings, etc.)
They can fix it by returning the banner to its previous state (static image at the top of each page) and ditching the frames. Frames are poor design anyway... they also prevent pages from being bookmarked by the less tech savvy And the fact that you can't scroll the ad off the top of the page (if you don't know how to get around it) is a huge annoyance.
I have, but my computer is older and it is to be expected. Certain sites are very slow... Webshots is one of them. But I hate a lot of the changes such as toolbars/address bar that can't be moved or changed. I also hate tabs and they are the first thing I turned off. At least I could do that I much prefer multiple windows. I don't like Firefox and now IE is trying to be just like it.