I have several short sequences saved as separate Vegas projects with multiple layers of video that I would like to combine into one monster timeline.

The problem is that when I select all and ctrl+C and then ctrl+V them together, the video composite envelopes with all my keyframe level changes don't get copied over. It was a lot of work to set all those points and I don't want to have to do them again.

What makes this more frustrating is that I swear I did this before with another project...and now I can't get the program to do it again for this one. Does anyone have any hints as to what may be different this time?