Why am I getting an Excel 2007 "Document Not Saved" Prompt in Windows 7?

I have a client currently utilizing excel spreadsheets to save company benefit information. Last week their server shutdown and rebooted. Since then she has been receiving a “Document not Saved” prompt when attempting to change the data within those sheets.

She is setup in a share with the server and a terminal server. All files modify immediately after data entry and save.

I have verified the file paths to be correct. There is no disk quota being implemented on the Server and I was able to fix this issue temporarily by copying the folders, renaming them, and removing the old files. 6 hours later this issue began to reoccur…

Any suggestions?