Hi Paul and Vince,
I am having the same issue, except both the project files and auto-save files are blank.
I saved multiple versions of a project yesterday and today they won’t open, I get the error message “The project appears to be damaged, it cannot be opened”
When I open other projects in an XML editor the code is all there, when I open yesterdays files there is no code. (not sure if this matters but the size of the working project is 1.5 MB and the non working is 4.2 MB)
The projects that open were created with Snow Leopard as the OS, and the projects that have no code in them are from Lion.
After some Google searching I found this post: https://discussions.apple.com/message/15998556#15998556 saying that “an Adobe employee who said that Lion has a low level file system bug that can cause corruption” When I talked to adobe they said it was a Lion issue. When I talked to apple they said it was an Adobe issue and to reinstall Lion and Premiere.
Did you figure out your blank project issue? and Do you have Lion installed on your system?
best,
-Rich