Thanks for replying. I have found that when trying to collate several versions of books and/or mulitples by the same author etc that Calibre can do some really wierd things. As I tend to be doing thousands of files it's hard to understand which are caused by memory, which are race conditions etc.
Importing books which are corrupted does seem to have issues as well as books which use esoteric sub formats within the containers.
All in all though, for free it does a cracking job. I'm thankful for its existance
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