Recently, DICE posted an updated on the Battlelog stating that the issues PC players are experiencing with Punkbuster and other 3rd party services have been resolved, at least for the most part.
DICE’s update on the Battlelog read as follows:
Together with the 3rd party service providers we have taken steps to remove the faulty bans, and improve the protection against future fake bans.
We have determined that the root cause resulting in the server bans is not directly related to Battlefield 3, but rather related to select 3rd party services which server owners can use in conjunction with PunkBuster to protect their servers. If you are able to log in to Battlelog, your account has not been banned by EA or DICE so there is no need to contact Customer Support. This issue did not affect Xbox 360 or PlayStation 3 players of Battlefield 3.
UPDATE: As seen in the comments, we are receiving reports that this issue is still affecting some players. We are continuing to investigate what may be causing this issue with some servers.
If you are still experiencing problems please try joining other PunkBuster enabled servers – only a subset of servers are affected.
Hopefully those still experiencing issues will see them resolved quickly.