I am on macOS 11.1 (Big Sur) running KiCad 5.1.9.
I have precisely the issue described in Pcbnew window problem (MacOS) . eeschema seems to work fine, but pcbnew only shows a grey canvas. Files load fine, and even pcbnew’s 3D viewer works.
Unfortunately, the solution posted in the post linked above does not apply to me as the selection between Accelerated, Fallback and Legacy seems to have been removed.
Before upgrading to 5.1.9, I was on 5.1.0 which exhibited the same issue. The problem only came up when I upgraded from Catalina to Big Sur.
Is there currently a solution to this issue? Thanks for your help!