Originally Posted by TuxGirl
Since it appears that the creation of the html files seems to be complete, and just not recognized as so, would it make sense to try to cancel the conversion job, then try to use the debug folder for a conversion from html to mobi?
It's worth a try.
Also if you enabled any extra features such as heuristics try disabling those just to see if it changes anything.
Chinese may be part of the issue; if Calibre gets stuck on 100% CPU usage you might just have to add a debug message here and there to find out which function it got stuck in. Maybe it's looking for spaces between words or something.