I fly only in P3d in fullscreen mode. Unfortunately fullscreen mode what ever the reason, does not come alone with Navdia Inspector. Flashes happens when I open any screen.  if I fly windowed mode performance excellent and sim like a silk, but I like flying in full screen. Solution was get all windowed mode benefits and with Hotkey extend windowed mode to full screen (not fullscreen mode). Alt+Enter is not my desired solution  :)