Again, I have checked my monitor profiles and they haven't changed since this morning. It worked fine this morning, with the profile that I have now and it only stopped working when I updated CR. If it worked this morning, with the older version of CR and the same monitor profile, I have a hard time understanding how reverting to that previous version would not work? The link you just shared, the newest version of Camera Raw is from 2012 and I am sure there have been many updates since then. I don't know the version number of the CR that I just upgraded from but it would have been the version immediately prior to the most recent version of 9.12
The newest version on that page is 9.10, dated 4/11/2017. (9.10.1 was actually the one prior to 9.12, but for some reason it's not listed. And there was no 9.11 version)
I have no experience with rolling back Camera Raw, and I don't know if an older version will overwrite a newer version.
And there is no option to uninstall with the Desktop app, it says Uninstall unavailable.
I guess there's a possibility that you'll have to uninstall/reinstall Photoshop, and then manually update Camera Raw to 9.10
Adobe Camera Raw and DNG Converter for Windows
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UPDATES/PROGRAMS