I had problems also with this method of work:
- load assets for part of video
- cut everything for this part on timeline
- save project
- repeat for each part
Then I loaded all saved parts to project as resources - it loaded saved
parts as clips and all assets to resources. Then I pasted clips on
timeline of final video and made final cut. Then I saved final project.
Closed Cinelerra then I was unable to reopen saved project - it only
showed one of clips on timeline :-(