I have a dozen or so users connecting to an ASA 5510 via Cisco VPN client v5.0.00.0340 - this works successfully for all but one user. This user is able to authenticate to the ASA but unable to pass traffic once authenticated. He is able to send/receive traffic after someone on the inside of the network initiates any communication with the troubled user.
This user is running the same configuration as all the other users.