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Just updated to Big Sur and even updated my RAM - when I open LrC, (10.1.1 up to date) only a grey screen appears. Any insight?
The first thing that you should try is to switch off the GPU support from the Lightroom preferences and check if that helps to fix the issue.
Go to Lightroom > Preferences > Performance tab > Uncheck "Use Graphics Processor" > Restart Lightroom.
If Lightroom doesn't start correctly the please see "Solution 2" in the document behind the second link.
Troubleshoot GPU issues | Lightroom Classic (adobe.com)
Another step is to try to reset the Lightroom preferences.
If this doesn't help please check your monitor profile. It can be corrupt.
How do I change my monitor profile to check whether it’s corrupted? | The Lightroom Queen