Thanks so much for the link to the APS puck testing software. "i1Diagnostics 2.5.1" works, and my device passes all the tests! I'm stumped as to why this is behaving as it does. This Greenish Tint is just not right.
All the LCD screens I am testing are very old, and so far the youngest LCD screen is the only one giving me a profile that looks right.
During the APS profiling, 10 patches into the profiling (Create Monitor Profile "Optimizing"), the entire screen including the screen elements of the software (an oblong navigation blob with Home & the L & R arrows that is sorta shiny silver) picks up a definite greenish tinge.
I did an experiment and before profiling I used Apple's Display Calibrator Assistant to set the White point to D50, & Gamma to 2.2, and then when I ran the APS profiling the "greenish tint" was less than before, but is still evident.
I will play with all this later, but I thank you for helping me verify that the puck is not damaged.
Any other tips, tricks, comments or opinions are welcome.
So long for now, TOM