I'm having sort of the same problem converting to mobi except after the conversion to mobi starts it runs about a minute and Calibre shuts down. Below I opened three books, everything fine. Then started convert and shut down happened.
calibre Debug log
calibre 0.8.69
Windows-7-6.1.7601-SP1
Windows
('Windows', '7', '6.1.7601')
Python 2.7.3
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Starting up...
Started up in 13.93 seconds with 6304 books
Worker Launch took: 0.389999866486
Worker Launch took: 0.265999794006
Worker Launch took: 0.264999866486
Worker Launch took: 0.671000003815
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