I've just subscribed to Adobe CC and installed PP and AE amongst others. Everything appears to work fine except AE which keeps crashing.
I can create new comps, including imported stills and video clips, but if I open an existing AE project (created in CS5.5 which I have been using up to now) CC2017.1 opens it and begins conversion, begins to display the comp, then crashes. It seems to do this only with comps that contain video clips. I have one existing project that does not contain imported assets except audio, and it opens and plays correctly.
At the moment I can't use the great majority of my existing projects. I have uninstalled and reinstalled AE to no avail.