More clues:
My Dell3007 may be 10 years old, but it's been in storage for 8 of those years (climate controlled, dust free). So I doubt aging of the CCFL screen is to blame.
I don't believe the white balance settings on my video camera, which recorded the video I posted on YouTube, is relevant. The Youtube video was merely to show the alternating cyan/magenta seepage, not to point out the quality of the white point.
color seepage by
texshooter, on Flickr
And yes, the Dell factory profile cures at least 50% of the cyan/magenta seepage problem.
I've attached the Dell factory profile to this post. Perhaps it bears a clue to why it works so much better than the custom profiles I posted earlier. I suspect something screwy is going on with how the LUTs are working (or not working) with my custom profiles. That doesn't mean it's X-Rite's fault. There could be a problem with how the vsgt tags are loading, like Tim was saying. Or something could be wrong with how X-Rite's ADC is handled by the computer. Unfortunately, I wouldn't know where to begin to test whether the problem is with the graphics card or the monitor. Did I mention this darn thing doesn't even have knobs to control contrast and color temperature? Jeez, even my first TV when I was a kid came with those.
I've borrowed a friend's monitor and will be doing some tests on it, as well. Wait, I thought I was moving on with my life?