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Problem solved, thanks to the persistence of a wily grad student and a lengthy back and forth with Jeff. Thanks again, Jeff! You're always a huge help.
To those having similar issues:
It turns out that our projector's listed specs were inaccurate, and it did not accept a listed 3D format. This is BenQ's fault. So, we abandoned the use of DLPLink on our Geforce card, and instead got things to work using a Quadro card using the Quad_Buffer option.
Just FYI, to enable quad buffering, we had to go into nVidia control panel and enable stereo mode for "winviz.exe" and not "Vizard.exe".
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Info. summary in case anybody runs into the same trouble:
1. BenQ MW870UST 3D DLP link projector.
**Set at a resolution supporting 120Hz.**
2. Generic active shutter glasses.
3. nVidia Quadro 4000
4. Vizard 5 32 bit
i. Run and close application once to register with "nVidia Control Panel" automatically.
ii. If "winviz.exe" does not automatically populate itself on "nVidia Control Panel -> Manage 3D settings",
click on add and navigate to Vizard's installation directory and select "winviz.exe".
iii. Enable stereo mode for "winviz.exe".
5. Run code with the "viz.QUAD_BUFFER" flag.
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