I am using firmware 1.1 and this happens to me when I overwrite a book file with a new version. This workaround works for me when I need to overwrite a file:
1. Connect Nook to PC.
2. Delete epub(s) from Nook I want to overwrite.
3. Eject Nook(safely).
4. Reconnect Nook.
5. Copy new files to Nook.
Hope this helps.
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