On Sony Vegas pro 8, I made a music video, and I saved it since I was going to finish it up later. I opened it later on, and for some reason, the audio works, but the movie clips can't be seen (It's all black). It does this everytime.

The only way I can see the videos, is if I render it right after I finish, without saving the files (Which can be a pain)

My question is, how do I save it so I can see the movie clips (Without rendering). I couldn't install mediamanager2.3 (I don't know if this is the problem of why the movie clips don't appear), but it wouldn't let me install it. If this IS the problem, then is there a way to fix it?

Thanks : ]