Anyone else have a weird problem w/ firefox?

[rendrag]

using firefox preview release on 3 computers. from time to time, on my main machine, the firefox window will start to shake vertically. Once it happened right after an ff install. Other times it would work for a while, then start this problem. I've tried uninstalling firefox, w no sucess. The only way I was able to fix it was to re-install windows. I don't want to do that to my main machine since I run games and such, I'd rather not have to reinstall everything.

The specs are as follows:

athlon64 3000

asus k8n-e

ati aiw 9800pro

the only thing I can point to is the radeon because i recently changed the motherboard, cpu and hd. my other systems have never experienced this problem.

anyone else run into this problem before? i'm using the catylyst control center that uses .net. I have thought about reverting to an old driver version, but i'm wary of screwing everything up by doing that.

what do you guys think?

thanks