Cisco VPN Client broken in Tiger - To be fixed in version 5
Cisco has a bug ID assigned CSCeg48152. It will be fixed in the next version of the Cisco VPN client for Mac version 5.0 Target is about 2 weeks. I'm told they are working hard and treating it as a high priority issue with development. Keep your eyes on the download section of the cisco website for the update.
I'll post when I see it updated here as well.