Hi,
This is an interesting situation and I was wondering if it is Windows7 64 bit or 32 bit?
I've noticed similar glitches in the Windows 7 64 bit OS but dismissed them, as I do a lot of beta testing and just thought it was due to that.
I also find, because of the testing, that when I reinstall the OS (Which I do with regular monotony) I can't always recreate the problems, hence making me think of driver issues. Could it be something fundamental within Windows 7?