Replicate not working

Replicate not working for me, on 1.1.3 or 1.2.0. Hog 4 or Hog 4PC

Admittedly using a hog 3 showfile but still.

Show loads into hog 4 ok but gives 'database commit failure' after replicate command. replicate is not performed.

Created new hog 4 show and merged in fixtures (not types) and the rest of the show from hog 3 showfile. Replicate still not working.

Fortunately show loads into Hog 3PC 3.2.6 fine where replicate is still working.

not the best workaround though.