[Richard Wold] “I used to be able to do this in Vegas years ago. I think last version I was doing this was v4. of course been using more recent versions since.”
Did you read the information in the link you pointed to? Vegas 4 handled this differently. It says:
The compositing model in Vegas Pro 6.0 and later differs significantly from the Vegas Pro 4.0 model. To reproduce the Vegas Pro 4.0 parent/child masking behavior, set the compositing mode of the parent track to Multiply, and then apply the Mask Generator plug-in as a track effect on the parent track.
Actually, I just tried using Parent/Child for the original posters problem and it worked fine for me. No need to use a nested project as I suggested.
So now I’m wondering why it didn’t work for him. I added the Composite Mode to a title track, then placed both the title track and lower third track under a Parent track and the composite mode only affected the title and lower third and not the video below it.
~jr
http://www.johnrofrano.com
http://www.vasst.com