ok.. so to narrow it down even further.. It's one new layer (normal bitmap) that causes this whole issue. As soon as there is keyframes on it or I parent it.. the issue appears.. hmm.. weird. Any ideas why?
Does CC (version 12) work without the error?
Working with this further I discover that the error also appears if I tweak any of the transformations settings for the layer and add a parent to it.
I actually found a workaround.. I have an adjustment layer with Reel smart blur and glow on it (which I forgot to mention) which seems to be connected to the problem. I put the problematic layer on top and it seems to work.. Perhaps I maxed out the amount of layers RSMB could handle? Weird because it worked as long as I didn't parent it or changed the transform settings?..
A well.. problem solved for now.
I had this problem, and I solved it disabling the multi-cpu support...