thought this might help for those who are still struggling with this issue. At least for me, this change from esri solved my problem. Go to C:\program files (x86)\arcgis\desktop10.7\bin\configuration Rename folder CATID to CATID_old Restart arcmap…. All should run properly. supposedly a corrupt config file in that folder. The odd thing is that when arc map runs successfully that folder and config file are not re-created.
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