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I suggest resetting preferences.
Hi @Gummo
I misunderstood, and looking at your screenshot, I now see the banding you refer to.
That is odd. Here is one thing to try to help tell if this is a Photoshop or color picker problem.
I have attached a PNG screen capture of my color picker, and it's in sRGB. I suggest bringing that into your CS6 and pulling up your color picker side by side to see if it is only the color picker.
If it's in both, it may be a system issue. If it's just in the color picker, I suggest resetting preferences. Other than that, I don't recall having or hearing about such an issue, so I'm not sure about the next steps.
I'm unsure if this will help yet, but I thought it was worth trying.
John Wheeler
PS: I reset my preferences yesterday - with no effect.Try resetting your Ps prefs.............this cures a lot of these strange issues. I thought I had already posted this suggestion yesterday...................evidently I did not!
Thanks very much for your help, John. All the best.That's great @Gummo
It made sense that when my color picker image on your computer appeared with the same problem, it was a system issue, not a Photoshop issue.
It may never be known how settings were changed, yet a solution was found, and that is a great ending.
John Wheeler