Quote:
Originally Posted by KevinH
One extra point ... as a good general rule, I highly recommend you never leave an editing app running for over 48 hours without saving and closing out. Power failures, disk sleeping, temp space cleaning, and other glitches makes that an unsafe mode of operation for any OS.
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It honestly baffles me why anyone would employ a workflow that involved leaving EPUBs open for editing while they went to lunch, let alone overnight, or 48 hours.
If you say it's possible, then it's possible.

But regardless of how it's happening, the manual steps the OP documented to fix the problem is unnecessary. Just saving the EPUB with Sigil will fix it--provided you don't leave it open for 2 days again. Or if you insist on leaving epubs open for days on end, you change Sigil's temp file location to somewhere you have full control over.