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CS6 is not supported in High Sierra. You've upgraded past the point of compatibility.
Your only option is to either downgrade your OS or upgrade your Lightroom/CR.
You can get the Sierra OS download here:
Thanks for the reply,
As stated, I wanted to Upgrade to Sierra, but it is no longer available. I've been on the site you mentioned, but they are all Updates, not OS Upgrades. Obviously I cannot update an OS version that I don't have installed. I would have to get the original Sierra Upgrade, but again, that is not available. I've checked online and it's nowhere to be found. Apple was really pushing High Sierra and totally dropped the Sierra Upgrade in the APP Store as well. As I mentioned, every aspect of PS CS6 that I have tested works flawlessly in H.S., except for Camera RAW. I do still have an HDD with Yosemite installed, so I can boot on that one for CR processing if necessary. Not very convenient, but the price I pay for not noticing that CR is not supported in H.S. On the Apple forum there is a plethora of issues with H.S., most of which I have not encountered, so I'm hoping that the next H.S. update might also cover the dialog stickies in CR. As mentioned in my OP, I imagine those dialogs are managed by the OS and not Adobe. But of course I have no way of verifying that assumption.