[ubuntu] Remote Desktop Fails for One Particular User

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http://ubuntuforums.org – Running 11.10 patched up to date. When one particular user is logged on to the "target" computer and I try and connect remotely to the desktop from another computer, I get the message that the server has closed the connection. However when another user is logged on to the "target" computer, remote desktop works correctly. First thing's first - I checked the Remote Desktop settings available through the GUI - and they're identical to those of user profiles that succeed. So then I checked the group membership of the failing user - the user is in the Administrators group (Hardware)