I’ve been assisting on a two-week edit and my editor has been plagued by this problem. Now granted, we are not working with the best set-up. Our house has been growing faster than we can build it and he is using two partitions on Terrablock, an external G-Drive (via Firewire 800) and an external. 3 TB JBOD array. I know; not the ideal. However, others with cleaner, more consolidated work-flows are having the same issue, so although our set-up may not be helping the problem, it’s not at the root of the issue.
But we are having the same errors. First the Autosave cuts off and then FCP won’t let you save at all. Not even under a different project name/location. We’ve lost hours of work. Copying and pasting everything over to a new project is the only (and unfortunately poor) workaround we can come up with. After scanning the forums, we are clearly not the only ones having this issue with FCP 7 and Snow Leopard. It’s not the permissions (all set to read/write). Deleting the preferences is not an option since you have to quit FCP to do it. Saving XML’s comes up with the same error message (Operation Not Allowed), so they’re no good.