If you are using IE 8 beta 2 and your zoom is NOT at 100% you could be having all kinds of issues from performance to skipping around the screen and being unable to select text. This doesn’t seem to be a big issue, I mean who runs at anything other than 100% but it is bigger than that. See in IE 8 your DPI settings will effect the zoom, so if you are running 1280x1024 or higher by default you will be at 120DPI and not the standard 96DPI which means you will run at 125% zoom in IE! It also effect people using the zoom for accessibility reasons.
There are two items available for voting on for these issues on Connect, so if you are an IE 8 beta user please take the 5 min to first test yourself and if you are able to repro the issue please vote on these items: