I just started encountering this about half a day ago.
I cant get the server list. Other than that if I try to start a server it will mess with the name, duplicating it and/ or puting random characters before or after it. It also modifed the single player kill messages. If I die from a prop landing on my head it will say: Inanimate object my user name. Its acctually pretty funny but the rest isnt. It also casues sound glitches.
Edit: fixed the server list problem. It had nothing to do with lua.