Meanwhile, a hint on this undo subject for script/plugin writers: I found out it to be more eficient in memory usage, if aplicable, of course, to create a new image, disable undo in it (I cannont tell the difference between freeze/disable so far), and do your script stuff in there. When finalizing, copy your resulting drawable back to the original image. gimp_image_undo_group_start won't save your memory. BTW, some of the included scheme scripts could benefit from this. JS -><-