[eviltuna]

Re-ran Monsters. Here's the log

Logfile:
http://xbmclogs.com/show.php?id=30224

Also forgot to mention that the subtitles also work great, and sound seems fine as well.

hddvd mkv 1080p vc1 ap l3 18mbps ac3 none Direct hddvd remux - 9-11 FPS, very choppy, some artifact on start, sound stuttering, CPU0- 30-60% CPU1-70-100%
Monsters mkv 1080p h264 high profile 4.1 10mbps dts Unstyled subs Typical recompressed 1080p - 15-18FPS, a bit choppy, no artifact, CPU0-50-70% CPU1-70-100%, froze up on second run

VC-1 does not work in this build. Known issue.
I don't see a run with "Monsters" in your log...