Hi Neil,
I’ve gotten a message similar to this. Have you been using Sapphire? We’ve noticed that when Sapphire plug ins crash they occasionally corrupt the file. I think when the crash occurs, you’re given a chance to save the file, but when you do, it’s not saved correctly and thus the missing data in file. This makes this version useless. In general you should be saving multiple versions of your project, and backups of those projects as well, so that when you do get a crash like this, you only lose the work since your last backup. Unfortunatley there’s not much you can do when this happens. We crashed using sapphire (it may be unrelated to sapphire, but our crashes seem to be with this package) this week, and lost about 3 hours of work.
Sorry.
Mike