While I fully understand the frustration this situation has caused so far I wanted to share that for now (when experiencing the detailed issues here in this thread) we reccomend using Enscape 3.4.4 instead of 3.5.x. This is not meant to be an excuse, but unfortunately resolving these ongoing problems (in regards to using layers, freezes/slowdowns/crashes) proved to be more technically challenging than initially anticipated.
Our developers are of course working on these problems (and no further example projects are required), but for now there is no specific estimation yet as to when all fixes will be implemented. I'll share further updates once I'm able to, and will notify everyone in this thread once they are about to be added with an upcoming service pack or preview.
I am aware this may not be the answer you're looking for, but I still wanted to provide some additional clarity.