It doesn't have anything to do with build 10, but if you make your name too long, it can screw things up. Note that two characters are used for each color, even though they don't show up.
I thought I had it fixed, though. Could you email me your config (jitspoeATplanetquakeDOTcom) so I can do further testing?
Also, I got your email about the changing maps and stuff on a LAN server, but you didn't put a return address so I couldn't reply. You have to set the op password either in the server config or manually set it at the server. Example:
set oppass1 "whatever"
set oppass1level 150
Then from your client type "login whatever" and it will make you a level 150 op, so you can do things like change maps (newmap mapname), change settings (cvar_set ffire 1), etc. If you have direct access to the sever, though, you can just type things in there (gamemap midnight, set ffire 1, etc).