Okay. My game is registered with my key, and I'm trying to register my key in my User CP. I enter it, and I press "save changes".......and nothing happens. It doesn't say I'm registered or anything, and I can't upload any custom head textures. Could someone please help?

You didn't use a keygen did you?

No, keygens mess your computer up big time.

Well, there are 3 things I can come up with:

1) The key isn't considered valid by the forum. (Keygens usually get this...)
2) The key is already in use. (Buy a key a person people...)
3) Someone goofed. (Humans just aren't perfect, if they were, keys wouldn't exist anyways...)

i've got a key too that doesn't work =/

If you enter your registration key in the setup menu and press ENTER, and the 'DEMO' text in the bottom-right corner of the screen doesn't disappear,
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