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Maybe there's no driver for BootCamp yet? I'm assuming you mean Windows via BootCamp? Have you updated your BootCamp drivers? Virtualized Windows should not have a problem working on the LED ACD.
 
When I first tried my LED ACD in bootcamp it didn't work. I had to use the monitor property dialog to extend my desktop. Then I used the nVidia widget in the taskbar to turn off the MBP display so that the ACD would be used as the primary.
 
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