I'm now bumping into something weird: [please see video below]
when walking frame by frame throught an action timeline where switch layers switch images only the images of a switch layer show just fine in the viewport and switch as expected.
However when I press play to run the animation the current image dissapears and no image of the switch layer isn't show no more, eventhough they were working just fine before when I stepped through the frames.
This doesn't make any sense to me and I'm stuck on this. It starts to feel like a bug, but I've seen the same kind of method working before in another file so I just don't get why it's not working now.
The only animations in the whole file are just two action timelines which both eacht control a complete different switch layer, so there could not be any conflict. Both timelines do have the same issue tho.
I'm at the point I need to decide whether or not to continue this somehow or to throw away hours of work, because I can't get it to work no more and it's taking me way too much extra time now (it's already the third solution because some other things didn't work as hoped

Anybody familiar with this and who could tell me if this something I'm doing wrong or a known issue of some kind perhaps?