"Operation not allowed" problem

I am trying to save a project that has automatically saved over the last few months. Only now instead of automatically saving, I get an "Operation Not allowed" box, which comes up even if I try to manually save. I changed the System Settings to a drive with over 500 GB free, but I still get this message. Any ideas why this now comes up and how I can overcome this to save the project?
OS X 10.6.8
FCP 7
MacPro Intel dual core

I found how to deal with it. I copied the entire project to a new project and saved it successfully onto another drive. Thanks anyway. You guys are great.

Yeah this happens with a corrupt project - always a good idea to have Digital Rebellion tools for dealing with corrupt projects and make a backup of your projects in XML format as this can be more easily rescued.



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