I just tried converting an epub to pdf in 7.4 (and I do not like 7.4, just too lazy to backtrack at this point) it converted perfectly. Then I tried a .lit file and it was flawless as well.
My only suggestions are
1. copy then delete delete the Calibre configuration directory (copy so you can restore it if you want to or just delete it to the recycle bin.
2. Uninstall, then reinstall Calibre if first step doesn't work.
I have had to do this twice for different odd occurences.
Helen
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