I have Minecraft, and when i try and join a server, it says my username is longer than 16 characters. I think it is trying to use my full email address. Is this the case? What else would cause this error, and what options do I have to try and resolve this?
This (obviously) occurs when your username is longer than 16 characters....
And this means any character: Any letter, punctuation mark, number, or symbol.
So, If I did "MyUSERNAMEIS12345!!!!!!!" (24 characters), it would display the above-mentioned error.
Minecraft would never need your full email address while joining servers, so I don't suppose the problem is with that. Check your username length.