OK, so your dual display card has a 15 pin VGA port and a DVI (digital video interface) port? might have something to do with it...
Digital Monitor...hmm....I think I've read something about digital monitors...lemme see...oh
here it is, but it doesn't sound good... seems like someone else using a LCD display was having the same or similar problem...
Or course this was with a touchscreen... no real answers there though... Make sure you have the latest version of drivers and DirectX.
I'm kinda just grasping at straws here, throwing out ideas, but have you tried switching which is your primary monitor and which is your secondary? Rght click on the desktop, then "Properties" then settings tab. Here you should be able to choose which is your primary display and which is your secondary. (Click the #1 monitor and use the drop down box below it to select the other monitor, then do the same for #2) I guessing but you might have to use the DVI with the VGA adapter as your primary and the standard VGA as your secondary. Of course if you're getting your desktop on your second monitor, I don't see any reason why it shouldn't work... this is an intersting one...
Of course I suppose there is a possibility that the older version of the demo doesn't support DVI ports? Not sure...George? Admin? MTUSUPPORT? Anyone? I would think dual display is dual display...
Sorry I couldn't be of more help.
Flip