PhotoScan version 1.3.0 build 3772
I was running Classify Ground Points in batch mode and PS froze at 9% on one of the chunks. I then tried to run Classify Ground Points on the same chunk (not using batch mode) and it froze at 9% again. I changed the Cell size (m) from 50 to 30 and ran it again. This time it completed.
This is a screen grab showing it froze at 9% in batch mode:
and this is a screen grab showing it froze at 9% regular mode:
Sorry it took me a few days before I was able to post this.