I have more to report. I can render video files (stuff I’ve captured, but manipulated) just fine. I’m having problems when I try to add overlays that I’ve imported from a dvd (from a well-known company that I’ve used before). I’ve also used these overlays on other projects before with no problems.
I’ve recently dumped everything off my computer and reverted to my old OS 10.3.9. I also re-loaded FCP 3. I took everything off my drives. Now I’m having this problem. The editing seems to work fine otherwise. Dissolves, etc. seem to render with no problems.