Having a 'mare today.  Had to strip out my hardware to replace a bung chipset fan, put everything back in, rebooted and XP went off and did a hardware driver update thing.

As far as I can tell it only updated the nVidia Forceware drivers but now when running MP RC1.0 I can't watch live TV without severe tearing.  Shows record and play back just fine, this is only on the live (and timeshifted) stuff.

Dead strange, in fact watching a preview in the TVServer config runs just fine as well.

Any thoughts on how to diagnose or resolve this?