Remote Desktop Automatically Logs Me Out Each Time I Connect

I'm encountering a very frustrating problem connecting to my office PC (which is Windows 7 Professional). No matter what client I use (Windows 7 built in remote desktop from a W7HP machine, Remote Desktop Client on Android, etc.) when I log on to the host machine it re-logs me on. Basically it seems to kill the previous log on session, logs it off, and then logs me in anew. This is really annoying. It closes all open apps and makes me reopen them. It takes much longer than a usual connection. I can't seem to find any reason for why this might happen, the only difference between this and the thousands of connections I've made over the years using RDP is that this is being done over our work VPN (A SonicWall VPN client). I don't see why that would make any difference but it's the only variable.

Any thoughts?

Try clicking start>run and then type 'mstsc /v:servername /console'
(Replace the servername with your RDP address). This will log you in as a console session rather than creating a new session.

Also have a read of this old thread:
Remote Desktop Logs off on Disconnect


Dave