Uh, wait, a slightly different set now worked. I'll do some more tests and eventually mail you what doesn't go through!
thanks 😃
Alright, I tested with different groups of images within my first folder and different settings. With 'Fast' checked it goes through so I'm thinking it's the sheer amount of images that locks it. I't not really freezed since I noticed if I hit cancel and wait a while, it does cancel the operation and Spine is functional. Could that be?
The tooltip in 'Fast' says the packing is not efficient, but what does that mean in terms of the atlas it produces?