Originally Posted by WEMV
I have encountered this problem several times. It turns out that each time it was because I had the epub file open in Adobe Digital Editions Reader at the same time.
Well that would obviously cause a problem, yes. ADE holds a lock on the file, and Sigil tries to replace that file with a new one: Sigil can't (ADE has the lock!), and then it crashes.
But that's a user error, isn't it?
Granted, Sigil shouldn't crash when this happens but gracefully stop the operation. And this is what it does in 0.2.0, now that the new exception handling subsystem is in place.