Close the sim and re-install your Navigraph navdata (simple click on remove and install button) via the Navigraph Navdata Center. Be sure, you have the latest version installed.
After that, start the sim and all is good. I assume you have cleaned/moved you community folder before the update. A very strange recommendation from Asobo which runs exactly in this issue. I know no other application worldwide which needs this … but anyway,.
Cheers
Richard