1. Is VPU recover enabled? If yes, try disabling; If no, try enabling.
2. uninstall ALL ati software (drivers and control panel). Ati has a nice little uninstall util at
http://www2.ati.com/drivers/cat-uninstaller.exe . Then run Driver Cleaner 2.6 to remove all the other stuff left behind (avail at
http://www.driverheaven.net/cleaner/download/DC2Setup_27.zip ). Then reboot, and reinstall 4.2's again. see if that helps
3. Worst case, try dong above (#2), but install the 4.1's instead, see if problems continue or not.
I've been on the 4.2's for about 2 days now, no noticeable problems yet (although I THOUGHT I saw some flickering on Caen that would be somewhat like what Musashi was seeing....)