Noticed quite a few people being kicked due to PB probs over last 2 days. Common error being PNKBstrB.exe not loading. I had same problem and traced it back to last update of my Nav/Firewall package (McAfee). Seems there's a history of Nav products like McAfee suddently blocking both pnkbstrb and pnkbstra .exe files. To fix you need to manually change the firewall settings and give both files full access. On my set up one file was in the COD main folder and the other in the Windows/shell32 folder. Then reboot and you should be fine. Sure there's some real techies out there who can give a fuller answer but this worked for me and it was driving me nuts for an hour or so till fixed.
Hope this helps.

This post has been edited by Capt.Furillo: 07/28/07 4:43am