Hi there, sorry to learn you have trouble with the game, it's very strange.
What name are you trying to type? (If it's not the default one), some stuff like bracket [] can break the code so I had a security, they wouldn't work and prevent you from going further. Maybe it's that?
If you have a controller on, it could also break it hmm... If the problem persist I will make a build with no name just for you because I really can't figure out what else it could be x)