Hey,
I have a similar problem, I just bought the game and I tried to play on 3D but it won't allow me to change it, I even went to preferences and enabled it, No luck.
Do I need to patch it or anything?
Message me back please.
I played this game for about the first 6 months in 2D because I couldn't get on with 3D.. But once I gave it a chance I found it was awesome! So much more fun than watching 22 blobs moving up and down, makes it realistic. Not really helping anyone's problem I know, I'm just saying it to all the idiots who claim it sucks..