I have had my site up for a while and have had no problems with user names that had spaces till now. I installed the phpmychat plug in and this will not accept spaces in the user names. If you click on the account information after you have logged in It says right there that the user name can not have spaces but if you click on the create an account before you are logged in it does not say anything about spaces.
I would like to add this in big red letters to the new account page. I am just wondering if anyone has suggestions how to do this and what file it is located in.