I've already changed the Environment to enable "Use Custom Variables" and added a "Prepend" "PATH" ""/Library/Frameworks/GDAL.framework/Programs:/Library/Frameworks/Python.framework/Versions/3.6/bin:""
I'm behind a corporate firewall, but I've updated my proxy settings to make sure plugins are working correctly. The "Processing" plugin shows up under "installed."
But "processing" is still missing from the toolbar, from the list under System > Options. So I'm not even able to reset that to the default.
I did not install this first in another language. This was directly downloaded from: https://qgis.org/en/site/forusers/download.html