Vielleicht hilft ja das:
"In your fs9.cfg under:
(DISPLAY.Device.NVIDIA GeForce4 Ti 4200 with AGP8X.0)
Mode=1024x768x32
TriLinear=1
TextureAGP=0 <------------------------- Add this line
PanelAsTexture=0 <--------------------- Add this line
By adding the PanelAsTexture line, your performance will even increase specialy with 2d panel 3rd party aircraft, it may cause 2-d panels to blank out if you've enabled AA inside FS2004, uncheck AA in fs2004, and enabling AA from your prefered tweaker or your driver display setting."
P.S.: @HeinzS

schneller