I'm having a problem with SD DVD playback... all my bluray movies play back beautifully, both off a disk and ripped MKV's off a server. A lot of my DVD rips (folder structure playing back through My Movies) though look really bad... the image seems to shake vertically by a centimeter or so... it's most apparent in still scenes were you can see it bouncing up and down at like 5-10Hz... it's really annoying and almost headache inducing.
It's not all the DVD's though, in fact it seems to be limited to older movie titles... The Lion King has it pretty bad. This seems to be something specific to this build with the Gigabyte board, as both my last two HTPC including a G45 based system did not exhibit this behavior with the very same rips. I've played around in the drivers and tried de-selecting inverse telecline, and trying other drivers, and other MPEG2 decoders, and nothing seems to help so I'm starting to think it's something related to the 9400. I haven't seen others mentioning it on this thread though so I'm confused. I've tried the latest Nvidia beta drivers, I'm running the latest BIOS, I've tried playing back at 24Hz, nothing helps.