This is what the problem is.
For whatever reason that windows media player can't play m2v files and PowerDVD can, is the same reason i believe that the m2v files are not opening properly in Vegas 6.0c for me.
The strange thing is that some of the m2v files do open correctly in vegas & wmp, and some don't.
What would cause some files to work, and some files not to work? they were all extracted & converted the same way.
Any suggestions? is it a codec problem?