I can't get in to the actual building of Funfrock Fortress. The double doors at the entrance of the building (the ones where you get the key from killing the groboclone that teleports after killing the rabbibunny clone). After collecting the key after killing the groboclone. I go towards the doors and they don't open. You can hear them opening but they stay closed.

Can anyone help or does anyone have the same problem. I have tried this on two different systems and I still get the same result.

Great, thank you.