Hello!
i have also encountered the same problem and it only started recently, probably due to the hotfix. P3D hotfix installed and repaired, all PMDG products up to date. The screen still stays black after creating a scenario.
I read somewhere to uninstall FS spotlights but still no avail. I did not install any new addons during this time, except a few aircraft liveries.
Any advice would be appreciated.
Regards
Franklin