App appears dark on LCD projector

Hi all,
I have a weird problem report, and I'm fishing for ideas on troubleshooting.
My colleague frequent connects to client's LCD projectors and some of the time our CVI-built apps appear much darker than normal on the screen. The darkness occurs for all colors ranging from (normally) light grey to deep blues. When he returns to PowerPoint or other non-CVI apps, there is no darkening of the projected image.
My first thought is that it might be a color bit-depth issue, but that can't explain why other apps are not affected - unless we are using peculiar colors that are badly affected when bit depth is dropped to 16 bits.
One unusual aspect of this is that he is using a DisplayPort to VGA dongle, since his Dell Adamo XPS does not have a VGA port. (It is Windows 7, 64-bit).
Any ideas on what could be happening?
Thanks,
Ian

This issue continues to crop up occasionally for all the CVI-developed apps that my colleague uses (~4).
The interesting thing is that I saw something like it for the first time today. I launched our app within a Windows Virtual PC (XP) and initally the inactive tabs of the app were near-black. Image attached. When I clicked on the app the darkness disappeared. It was repeatable for a while with each launch of the app only at 16 bit color depth, but then was no longer repeatable.
Perhaps this is a clue for someone more knowledgeable in how CVI renders the screens. I'm still using CVI 9.1.1(450)
--Ian
Attachments:
DarkTabs.png ‏2 KB

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App appears dark on LCD projector

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