gimp 2.6 started moving AWAY from the GTK api and using the NEW gegl api
- this was the start of the FULL REWRITE of the program

with 2.8 gegl is being used for most things

when gimp 2.10 ( or 3.0 ) is released it will no longer use the old gtk code for making a image
- no gtk drawable
- everything ported to GEGL

this rewrite can mess up scripts that use the older gtk api


for hex grids i use the G'Mic gimp plugin
http://gmic.eu/


BUT
there is a temp hack workaround
edit line 120 of the script
Code:
  (gimp-brush-set-radius brushTemp (/ inStroke 2))
------ to this ------
  (gimp-brush-set-radius brushTemp (/ inStroke 10))