sry been busy diy'in, erm if you set up each mode in single/clone/extended individually; and apply them; as you switch between modes the drivers "remember" the settings of each(seem to here) it just takes time to set them all up.
for a lot more reading on multi monitor displays i would recommend taking a look around
http://www.realtimesoft.com/multimon/ ,lots of resources and a proggy to use monitors better.