i'm facing serious trouble with a project of mine.
it's extensively comp'd, with different transfer modes, 3d particles etc.
problem is, in half resolution render everything's fine
in full (1080p) either in compressor or motion itself,
some frames make trouble..
transfer modes and masks seem to fail, leaving the frame with
next frame's good again...
then again somewhere problem...
The only time I've ever had a problem like that is when the Render Quality is not set to Best when it should be. Make sure everything is set to Best. If that doesn't work I would make sure I have the newest update of Motion. Hope this helps.