People running Macs and calibre before 0.7.7 have reported something like this. Does that match you? If not, then run calibre in debug mode to see if it is saying something. Open a command box/terminal and type calibre-debug -g. If there are errors reported, copy the output and post it. Use 'Spoiler' (the crossed-out eye) to post the log, so that the possible 100s of lines aren't shown until someone wants to see them.
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