Hi,
i found out something and may be it will help you to find out whats going on with the black flickering.
When i will start P3D with the Chessna i have may flickerings and when i will start it with the PMDG 737 NGX i have no flickerings. I guess it can cause in two things (may be):
1) The pmdg needs more performance so the fps are lower and may be lower fps will result in less flickerings?
2) May be the the propeller animation of the Chessna causes the flickerings? The PMDG does not have propellers
Greetings