I’m using FCP 7 on Lion (without the support updates) and I’ve been getting the same error message too.
I’m not using stills of any kind and I only had one sequence in the project.
The one comment that was helpful was the comment was Chee-Han Wong’s comment about FCP not liking H.264 format. All of my screenshot video’s are in that format.
However, I do not think that was the entire problem, and I think some of it is related to the render files, which I’ve been having a lot of problems with anyway.
My fix was:
– I deleted the render files
– I copied everything in the timeline over to a new sequence
– I started adding more videos to the timeline
– I have rendered the new videos
– I have not rendered all the previous edits
Everything seems to be working alright now. I will continue to edit until I’m finished (or run out of memory again). I’ll post back with any more problems.
~Matt