ran into some trouble with 0irc and nicks, ill try to explain it here since there's maybe more users with the same problems.

I setup my nicks like this
nick Fate
altnick Fate_XiZt3nC
username Mike

when i ran 0irc with these settings and had to use the altnick it displayed as Fate_XiZt3nCMike, with other words it added the username after the nick. i went thru all the config files and found no errors so i begun testing different nicks.
i swiched my nick with my altnick and what happened was that it was displayed Fate_ instead of Fate_Xizt3nC. I then tried to remove the underscore and what do you know, everything works fine again no username after alt nick or loosing half the nick.
unless underscore has some strange power in the config scripts that i dont know of its the dll that needs an edit.
hope the explanation wasnt too confusing and that it will come to good use ;)