Excellent, I'm glad I googled up this thread. I'm user of both XBMC (for Vidoes) and Windows 8 x64 MediaCenter (for PVR) The lines/mouse cursor corruption in XBMC is pretty annoying. I'm downloading the Beta drivers now! (slowly)
So this "should" fix XBMC, but I'm also hoping it fixes the Stutter in Media Center x2 playback. It was smooth in Windows7 but jerky in Windows 8.
View topic - Video Stutters in Windows 8 with 2x Speed Fast Forward
Here is an example of the herky/jerky x2 video playback:
Video Stutters in Windows 8 with 2x speed Fast Forward - YouTube
Are these problems at all related? Sorry to hijack the thread here, but hopefully you can pass this along to the engineers as well! I'll open a new thead if it's not related.
Anyway, here I go, I'll update my response here in a a few minutes with the results of the Beta driver for both XBMC and Media Center x2 playback.
UPDATE:
Driver Date: 6/11/2013
Driver Version: 9 12 10 3214
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XBMC - Fixed! (I think)
Media Center - No Change, x2 video playback is still herky jerky :-(
I started a new thread: