I too am having the same problem!!!!
I’ve sort of boiled it down to using unsupported effects (which is a lot) and video or precomps. If I do VERY simple stuff with only AE tools and effects, it seems to work. However, when I do ANYTHING complex with precomps, footage or motion blur, it kicks out that warning!
I can’t find any specific answers on this issue, just that people all seem to be having the same issue.
Any hardcore techs/AE Users/Developers out there that can comment on this????????
Thanks