I made a topic in the general discussion ( in more detail) section but I am referencing it here because I had no replies there and it is a gamestopping bug and maybe the developers only look here. In short the exit portal doesn't work, I just walk through it and eventually fall in darkness since the floor just stops. Restarting checkpoint or dieing doest fix it. I spend quite some time in the hublevel (frozen paradise?), I have all 6 crystals so I don't really want to restart the level if possible (it doesn't help that I had to replay the previous level due to another gamestopping bug). A fix could be restart level and that only the sublevel restarts but I don't want to risk that just yet without some confirmation.