Hi,
what IP Address has the PC after logoff ? Is it in the logon VLAN or has it a Windows dummy IP (168.X.X.X). After logoff the IP address of the switch port looses its VLAN. I have changed the timer so the switch port will be in the vlan for about 20 seconds after logoff, so the client can finish its work on the network.
Go to Domain Logon Options ->
Delay switching of VLAN after logoff = 20
Then you have to wait 20 seconds after relogon !!
Horst