The default printer setting is changed on the console after you disconnect a remote desktop session from a Windows Vista or a Windows Server 2008-based terminal server
In a network environment, you disconnect from a Remote Desktop session on a terminal server that is running Windows Vista or Windows Server 2008. Then, when you log on to the terminal server from a console, the default printer setting on the terminal server is changed.
When this problem occurs, you may notice that there is no default printer or that the default printer is changed to another printer.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB972600.