I think I found the problem several hours later. The conflict seems to be with RoboForm, a program I have used for years. I guess in one of their updates they became incompatable with Calibre. This is a repeatable crash with the same cause. I reboot, run Calibre with Roboform running and when I try and do a convert from epub to mobi Calibre shuts down. I turn off Roboform and Calibre converts the file everytime and continues to run. I even got a copy of Roboform2Go, the portable Roboform that installs on a USB drive and it acts the very same way the desktop version works. This might be something someone else has found and reported but I never saw it. It also could be something that happens only on my system.
Thank You all for the help
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