Virtual PC 2007 does not go into fullscreen mode with multiple monitors?

My setup is a widescreen laptop on my left (primary monitor) and a 19" flatscreen on my right. My laptop is plugged into a Dell docking station.

I use Microsoft Virtual PC 2007 to host my development environment on my 19", but sometimes find that when going to fullscreen (CTRL-ALT-ENTER), the VPC window disappears from both my desktops and is only usable from a reduced version.

I have found that the only way around this was to go into the Display Settings, disable the second monitor, click Apply and OK and then return to the Display Settings and re-enable the second monitor.

The fullscreen features works after that.