Dear Adobe,
I am a big fan of you but you cannot do such big mistakes like releasing After Effects CC 2017 with huge bugs on elementary tools. I have the same problemes of crashing while previewing and even though I did all the changes recomended on this post I still was not able to resolve it. On top of that I cannot go back to the previous version of After Effects.
I wasted a day of work because of this and what you did is very unprofessional!
Andrei