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Hi Michelle and others
I have attached the examples as required. Image (shot at 16 Bit Adobe RGB) was converted to 8 Bit sRGB in Photoshop. No adjustments in Ps other than basic adjustments in Lightroom. 
Hope this helps.
Thank you.
Hi Pat!
Thank you--this really helps.
This may be basic, but I wanted to mention a few things regarding the Eyedropper in the Adjustment tools. When you use the White point, you want to find the lightest part of the image. The area that you have selected is more around the 20-25% range and if you clicked there, then any part of the image lighter than that will be clipped to white.
When you have the Curves dialog open, if you place your cursor (do not select any of the eyedropper tools) in the image on the area you chose and then hold down the Opt or Alt key, you will notice that the value you're hovering over shows up as a little circle on the Curve right around a quarter of the way down from the top right. So if you clicked there to set the white point, everything from that point up would be pushed to white.
With your image open, in the Curves panel, select the white eyedropper and hold down Opt or Alt key -- and the image will turn black. This will show you only the areas that are the whitest part of the image--which in this case is the area just to the left of the man's arm. If you click in that area, you will set it to become the whitest values in the image.
Do the same for the darkest part and you will find that under her arm is the darkest part of the image.
The Gray point eyedropper is used to set the neutral value in the image. You want to find something in the image that is closest to a neutral value, which in this case is actually the watch on her arm. If you use that to set the Gray eyedropper, you will eliminate the color cast. The Gray eyedropper tool works best on images that don't need a big adjustment and have an easily identifiable neutral area. You might need to click once or twice to get the hang of it. If you don't like the result, hold down the Opt/Alt key and the Cancel button in the dialog box will turn to Reset and you can start over again.
I have attached a link just below to give you some information on how to effectively use the Eyedropper tools in your adjustments--I find this to be really helpful.
Adjust color and tone in Photoshop
I find that if you use the White eyedropper first, the Black eyedropper second, and then follow up with the Gray that I get better results.
The image on the left is before and the image on the right is after. The change is subtle, but you can see in the curves panel on the right how the curve was adjusted.
By the way, have you tried using Camera Raw?
Try this workflow out and see if it fixes the problem you were having with setting your Gray balance.
Let us know if that helps!
Michelle
I can easily replicate this all the way back to photoshop 6.0.1 running on mac os 9.
Cannot so far replicate on photoshop versions older than photoshop 6.
Just draw a curve in any of the channels similar to below and then try to use the Graypoint eyedropper.
You should report this over here where adobe wants users to report potential bugs.
Photoshop Family Customer Community
Although this post does not relate to solving the OP's problem, it was fun to toy with it.
c.pfaffenbichler​ nailed it. Something wrong with the Blue channel. Looking closely it seemed the color was transposed but not its tonal scale, suggesting a Lab correction for starters where tonal scale is discrete from color. The b channel was transposed, followed by curve adjustments in all three channels. Lab is not the mode for tweaks so the mode was returned to RGB for further curve correction.
It needs more work, perhaps with a mask take down the magenta cast in the area surrounding the car clear to the horizon line since it would also help the greens, too. But for this exercise only Curves were used. Trickier than it looks. Give it a try.
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