The punkbuster seems to kick me instantly when I am joining the ST.L server. It happened when I was playing with Hazer, Arborist and ROginia. Also, PB kicked me from OSF Mesa when I spawned as US. The servers sometimes ask me to type pb_security 0 because my PB is out of date. When I run PBsetup and press "look for updates" it says it's up to date. It asked me to type that command in the STL server, and I did. After a while, when I was on proto roof after I killed arborist I got kicked. I joined after I found the server again and it instantly kicked me after saying in the console "PunkBuster/PB: Not connected to a server". I got tired after a while and joined mesa, where I got kicked just when I spawned as US.
EDIT: I joined ST.L and I wasn't kicked, but the server occasionally tells me that my PB is out of date. I will see if it asks me that again.