I encountered a similar problem last night as I was about to convert a PDF to Mobi. Vista does the fade out semi lockup and says "calibre is not responding" and asks what to do after three closes, I chose "Wait for it to respond" and after about a minute it brought up the convert box and I proceeded to convert. Seems to have done it and shows what I would expect of a conversion, better left as a PDF for my DX.
Not a crisis for me but thought you would want to know of a similar PDF event.
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