Thu Mar 07, 2013 6:59 pm
After more research I have found a solution, it appears to be a problem with Sony Vegas 12 (most likely 10 or higher).
So if you are having problems loading mp4 files into Sony Vegas and the video does not show up, simply do this:
1) Go to where Sony Vegas is installed and go to \App\Sony\Vegas Pro 12.0\FileIO Plug-Ins\compoundplug\..
2) Rename compoundplug.dll to compoundplug.dll.old or simply remove it.