LR4 beta white balance on cropped images

I'm not sure if this has been discussed, I could not find a post with silimar issues.
LR4 Beta 64 on WinVista : Nex 5N raw files
WB picker on a cropped image seems to give variable (and wrong) results
I wanted to tweak WB an image that I'd previously cropped and made some adjustments to....WB was already close, the picker on a white fishing bouy was at ~90/88/91. Clicking the picker on bouy gave a strong red shift, about +5 on the red.
1st time I did it I thought I'd jerked the mouse somewhere, tried it again.. and again with similar results. Repeated several time.
I opened LR3 and had no problems with the same image.
I reopened LR4B and got the same problem again.
Undid the crop and the WB adjustment was fine.
I went back to LR3 and cropepd the same image the same way and WB was fine.
Went back to Lr4B and again, WB was off.
I reset the image so that it had no other adjustments. WB was OK but again when I cropped it it was off.
Opened another image and did the same thing. ie full image WB was OK, cropped I got a +5 or so shift, although this time in blue.
Tried it with a different crop and got a -15 on red.
WB zoom level was at max
Mike

Eric,
Take just about any photo and crop so all the sides are moved toward the middle. It isn't hard to find a point on the image where the white balance dropper looks like it's over a near-grey(and its numbers say near-grey), but when you click, the picture gets an extreme colour cast. And the point where you click doesn't go grey, either, but moves much farther from grey.
Here's the crop:
Here's what happens when the eyedropper is over the almost-grey snow:
Note what's happening in the Navigator preview. It's as if the eyedropper were over the yellow jacket, but the numbers on the loupe show grey.
Hal

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