Terminal Server sessions not logging off completely

Hi there,

we have a Windows Server 2008 box that is running as both a Domain Controller and Terminal Server for a (slowly increasing) handful of off-site users.

Everyone can log on fine but now and then there in issue that arises when someone logs off. It's happened 3 times, twice with the same user. They click on logoff and the screen returns to that blue/green server 2008 background and then does nothing.

The user cannot log back on and the session has to be logged off by a network administrator. The event log shows no issues with the logoff at all.

We have another server 2008 terminal server that runs off a server 2003 domain controller that has had the same issue once or twice so I'm assuming that the combined DC/TS is not a factor.

Otherwise I'm lost, any ideas?