[JohnL]

I updated Calibre to 2.40 (64 bit) and then added a few books that were duplicates of books I already had in the library. I then proceeded to look through the duplicates and I deleted a few of the duplicates. I then tried to open some of the remaining books and they wouldn't open. I looked at the folder in Windows Explorer and the all of the files were gone (not just the epub file but the jpg and opf files also). I was able to recover the files from the recycle bin and I placed them back where they belonged. I then tried to delete the duplicates and all of the files and folders were deleted. At one point even the folder for the author had been deleted.

Has anyone else seen anything like this? What can I do to troubleshoot this?

Thanks