Thanks, Marcel. I tried the tester, and, as I had thought, it confirmed that my nVidia card would work with it. Later, if I have the nerve, I will change one of the settings in the video card, then reprofile the display and see if it actually reset the video card.
Well, I just opened the nVidia Control Panel and under the Color Settings tab I set the Digital Vibrance to 0, and saved the new settings. I then opened the SpectraView II software and reloaded the last calibration/profile file I had done. It reset the display, with visible changes. I then reopened the nVidia Control Panel and, lo and behold, the Vibrance setting was back to 50% and the other settings at their neutral points, as well.
Thanks for the link to the LUT Tester.
For anybody else here who has had problems with oversaturated colors on their display, perhaps my experience can help them to discover double settings that interfere with proper display functioning.