Photoshop :: Undocumented Color Rendering Changes In CC?

Why is photoshop 14 drawing colors differently than 13 and is there any way to stop it?I have a 256 step, three channel wedge, made without dither or aliasing, which draws perfectly (no bands or crossover) in CS6.  This same file draws messed up in CC, with slight colors shifts and stepping. I have saved out the color settings from CS and loaded them in CC.  The individual channels draw the same in both files when viewed singly.While my monitor calibration has only been perfect this way on gamma 1.8 images (this is what I have my NEC spectraview software set to),  but it has been perfect, no steps, in both colormatch and gray gamma 1.8 from CS4 through CS6.  Now, comparing CC to CS, on the same monitor, same file, same settings, the channels draw identically but the color composite is different.
 
The screen shot of the color composite file is shows 3/4 tone changes:
 
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The same file with a solar curve on it:
 
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Channels draw as before, and match up, witness the screen shot of the channels lined up with a solar curve:
 
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I realize that this probably doesn't look bad in the context of a webbrowser, however, usless I've made some gross mistake, the rendering has changed and I see no documentation on it.