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Maddening!
I'm using 2019 because I hate 2021, even though its brush tool does work just fine. 2019 is aslo a tad laggy. I did just upgrade to Big Sur, on a 2014 iMac, so maybe that's part of the cause? I'd really rather not downgrade back to Mojave, as Big Sur fixed so many issues I've been having. And I have so many PS preferences saved, I'd so rather not have to reset them. But any ideas for a fix, I'm all ears!
ALSO, while you're here, after upgrading, NO photoshop icons are displaying in Finder. They only show the photoshop icon and not the actual thumbnail. I hate this. Fixes?
Thanks!
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CC2019 is not built for Big Sur and you will experience issues. The latest PS update from 1/11 addresses a lot of issues in CC2021.
One thing to check is your Apple System Security settings - making sure Photoshop has full disk access.
Other than that - it's going to be touch and go with CC2019 on Big Sur.
You could downgrade to Catalina but that would require a full reinstall of your OS (Apple doesnt have a direct way to backslide from Big Sur), which would mean you'd lose CC2019 anyway.
https://helpx.adobe.com/download-install/kb/macos-big-sur.html