ACR 7.3 Highlight Clipping Indicator

Just updated to the release version of ACR 7.3 and notice some weirdness with the highlight clipping indicator.
The file is from a Nikon D3 set at ISO 3200 with Nikon 24-70 f2.8 (shot at f3.2)
Open the file and all looks OK (it's noisy but what do you expect at ISO 3200). Set enable lens correction and the highlight indicator shows clipping with all other controls set to zero. OK I thought, lens correction is correcting for fall-off at the edges of the frame. Now go to the adjustments panel and just move the highlight conntrol to the left, you would think that the clipping would be reduced or maybe even eliminated - no the highligh clipped area increases in size. Zoomed in to 100% to see if it was a display anomoly, and no the clipping stays the same. The reverse of the shadow clipping I reported back in June.
Would have thought that moving the highlight slider to such an extreme value would have reduced the clipped area not make it grow.......
Here are some screen shots:
Image as opened in ACR
Now with lens adjustment applied
Now with highlight slider set to -85 (all other controls at zero)
Highlight at -85 100% Zoom
Update - something is not right with the displays with this latest version of ACR, opening up the shadows on the same image and the highlight clipping indicators actually show them decreasing
Another Update: These shots were taken in mixed lighting, colored gels adding to the mood of the icerink that were periodically changing color, ranging from Blue, Green, Red and combinations. Using the white balance picker on the white background the highlight clipped areas went away, but changing the color balance destroyed the mood of the scene as negated the color lighting effect. But should a change in color balance effect the highlight clipping so dramatically? Basically it looks like the highlight clipping indicator is being effected by contrast rather than the actual highlight values?
Running Photoshop CS6 13.01 (x64) on Windows 7 x64
Mike

We were discussing this in another thread several months ago
So, under certain conditions and when some camera profiles are used (both Nikon and Canon), it can happen that trying to reduce clipped area with sliders actually increases that area. It's caused by the profile as made by the factory (Nikon, Canon) and isn't ACR issue. I think I also posted a graphical representation of one profile showing why it happens. If not, I can post it
The fact is - sRGB / Adobe RGB gamut is smaller than gamut of raw image, so some colors are clipped even if they are not clipped in raw color space, sometimes in slightly unexpected way. However, if Adobe standard profile is used, clipping is performed according to ACR workflow which also has some drawbacks, which we also discussed in another thread on raw image from Olympus camera, several months ago
Showing area with RGB 170,165,180 as clipped is unexpected - can you post the sample ?

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