I have a Lifebook E8110 notebook that I shuttle back and forth from work to home. At work I have the docking station, and a 17" HP1740 flat panel display for a second display. At home I usually use it standalone.
If I undock the notebook and take it home, where it runs as a single display, then return to work, the second display is not recognized when I reboot in the docking station. I have to go into display properties and check the 'extend my Windows desktop onto this monitor' checkbox.
I'm running Windows XP SP2 loaded by our help desk, not Vista.