It seems to be a conflict with "market" that's built into the rom. I froze that with titanium backup and it seems to be working fine.
redownloaded, flashed, fixed permissions after setup, even froze market, play store still soft rebooting phone
Downloading and flashing now :D
Edit: wow great job.. so far everything works!
1 bug so far: when installing an app from google play, I get a soft reset.
Fixing permissions again to be sure.
Edit 3: fixing permissions didn't work. Soft resets when installing from googleplay
Bug 2...