Under the video output menu I have the display mode set to full screen #1 and have 'use a fullscreen window rather than a true fullscreen' toggled off. When I had it the other way my playback stuttered. I also have 'blank other displays' set to off, I don't have my HTPC connected to any other display. I have 'vertical blank sync' set to 'always enabled'. Under the video settings menu playback I have the 'Render Method' set to 'Auto Detect' and have 'allow hardware acceleration' turned off. This last one really had me going but I couldn't get some vids to play properly until I turned it off. A lot of the other options on this same playback page affect the interaction of your computer with the tv and can be changed if you have a PAL video and your tv gives you an unsupported mode error. Anyway, those are my settings and they are working great with blu-ray rips. Hope this helps, I know how frustrating sketchy playback can be. One thing I noticed was that when video playback was stuttering, if I went into the audio settings and changed the HD audio track (either DTS Master HD or Dolby True HD) to any other type of track the playback would stop stuttering. Only with the wasapi settings could I get the HD audio tracks to play nice.