Multiple image generation fails on stage 3 after first image

[Adreitz]

I was playing around a bit with your example.py script. I added a randomized seed (import random placed at the beginning of the script and seed replaced with random.randint(0,4294967295)) and set count = 3. This successfully generated stage 1 and 2 for all three images, but stage 3 only produced valid output for the first image. The other two came out as glitchy gray squares. No error messages were printed to Terminal

Stage 1:

Stage 2:

Stage 3:

(As an aside, it seems fairly straightforward to add support for using -1 to stand in for a random seed with one more line added to what I did above. Maybe this can be added to the repo to help non-programmers?)
(Also note the visible banding artifacts on the first stage 3 output.)