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I am occasionally getting issues with the sliders in Develop mode not responding to the up/down input from the keyboard.
Sometimes, if I go back to the Library and then again into Develop it will fix on its own. Now, it won't do anything. Even with a restart of LR.
LR Classic 10.1 on a brand new iMac.
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Have you considered resetting the preference file/
https://helpx.adobe.com/lightroom-classic/help/setting-preferences-lightroom.html
Warning, this will revert settings to defaults.
The preference file can get corrupt, leading to buggy behavior. A bad preference file will survive updates/upgrades/re-installs