I have spent days trying to fix this problem. This is major and worse than anything I’ve experienced in 6 years of FCP.
Trashed prefs, deleted caches, opened auto-saves, deleted render files, uninstalled FCP and reinstalled it. Some of these things seemed to work for about a minute or so.
I am on a Mac Pro, 2 2.8Ghz Quad-Core Intel Xeon, 2GB RAM. Running OS 10.5.6. All software is as upgraded as I can get it.
My project is set up for HDV and there were some SD clips I was working with. I have a hunch that this was somehow to blame, although the SD clips weren’t the only ones acting up and when I got rid of them the problem persisted.
I tried changing the workflow so that the project was in SD and I was down-converting the HDV files into SD sequences, which seemed to work for a few minutes then lo and behold… audio disappearing, audio out of sync, audio playing back slower.
When this happens there are times when even the audio meters show no activity despite the waveforms.
Am I alone in thinking that I’ve made a terrible mistake “upgrading” from my old G5 and FCP 5 to my new Mac Pro and FCP 6? I never had problems like this on that system.