Tried that several times but hasn't helped. I even deleted all books from one of my tablets and started a clean install. I was able to load all but 692 books...I closed out of program by mistake on desktop while multi-tasking.
Immediately signed right back on program and got the same error codes and it wouldn't let me do anything. I guess the only thing left to do is wipe calibre program from desktop and restore library from an older back-up and reverse load a couple of books that I know are not on the back-up. I just wish I knew where problem is originating...a book corruption or program problem..
Anyway, thanks for the reply.
