Error Message -- when closing a project in Project Professional

A

anum_10

We have Project Server 2007.

Starting this week, we have started receiving the following error dialog box
when PMs click 'File/Close' to close their projects in project professional.

The error dialog box says: 'File not found'. If we click 'ok'. It asks to
check-in the project and then the project is fine.

This error appears randomly. What could be the cause of this error? We have
not made any changes.

Please adivse. Thanks!
 
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