i myself didnt have any problems... as i allowed PB at the firewall.
the new update has upgrated the PB software to BF2142/ETQW style.
no more PB starts from in-game, game spacific.
they changed it because of the Vista windows premission problems.
now, there are 2 servicies that have to be ran, PnkBstrA.exe and PnkBstrB.exe
PnkBstrA has to run all the time on your system, even when youre not playing games.
while not playing, its in a "sleep mode" and waits for PB supported game to launch.
when you start a PB supported game, the PnkBstrA will fire up PnkBstrB, and thats the service thats doin all the PB checks.
so you have to allow PnkBstrA.exe and PnkBstrB.exe on your machine thrue programs like anti-virus, firewall, anti-spyware or others alike that can block them.