Vista - Remote Desktop Reconnect Issue

Hi,

I am having a problem connecting to a Vista Ultimate x64 host using Remote Desktop. The first time I can connect with no problem. However after I log off, using Start > LogOff, I can not reconnect. When I attempt to reconnect I get the following message;

The requested operation cannot be completed because the terminal connection is currently busy processing a connect, disconnect, rest or delete operation.

Even if I am physically at the host and attempt to login it just hangs and I have to hard boot it.

I am connecting from a Windows XP SP2 computer using;

Remote Desktop Connection
Shell Version 6.0(Build Number 6000)
Control Version 6.0.6000

Network Level Authentication not supported.
Maximum encryption strength 128 bits.

Thanks in advance,
John