gimp 2.9.x

[Ofnuts]

No 2.9.X environment.

Not too surprised that something as low-level as tiles is broken (or works differently) on 2.9.x (what is the bit depth of the image)?

First thing to do is add messages/print statements to see where the script breaks (does it crash, or it is just ending early?).

If there is a Python exception thrown, you can catch it and display it like this:

Code:

import traceback


try
   # Code with suspected Python exception goes here
except Exception as e:
   pdb.gimp_message(e.args[0])
   pdb.gimp_message(traceback.format_exc())
   print traceback.format_exc()