I just updated to the new 18.104.22.168xxx boxee build on my Box and something really strange is happening with DVD rips. Some movies, many but not all, start playing at double speed, like you've pressed 'play' and 'fast forward' right in a row. Others seem to start in ff for just a second but then correct themselves.
The fix for this is to open the controls with Enter, press rewind and the video slows to normal speed.
All test files so far are rips of SD DVDs stored on a NAS (ReadyNAS) as VOB files.