I had the same problem with P3D v5.2 Hotfix 1. I followed the instructions for Hf1 and encountered the black cockpit en sceneries.
Now trying a full reinstall.
Navigraph loading database problem in Carenado aircraft.
Perhaps this can help too: https://carenado.zendesk.com/hc/en-us/articles/220116187-Navigraph-loading-database