Hi! I need to see the PATH layer to diagnose the issue. You can send me your .aseprite file at gasparoken@gmail.com (I only need the PATH layer initially).
Thanks for the reply, I will do so! I'd value your input. This script is so incredible. Just heading to bed now, but will send it to you to check out on the morrow. (In the meantime I just reversed the frames, but still, would like to know what I was doing wrong.)
I found in the PATH layer that the white point is not white (0xFFFFFFFF) AND that the sprite Color Mode is INDEXED (until now only RGBA mode was considered). I already know where the problem is, I will update the .lua file in a few hours. Thank you very much for reporting it.