I'm not sure if this is supposed to happen but when I remote control a
workstation after the workstation has passed the client login screen
(either by logging into the network or by logging into the workstation
only) the desktop wallpaper of the workstation is changed to the default
desktop colour.

If I remote in while the workstation is still sitting at the login screen
I can log it in but the desktop doesn't change then.

Does anyone know how to stop this?