Hi,
Thanks, i read the comments you suggested. I have not upgraded so running 4.0, maybe its shaders, but i don't know enough about computers to work on that. In addition I have PTA using Matt's preset. Any other suggestions would be appreciated. As i said originally, everything is fine at the gate, push back, and for first maybe 4-5 minutes taxiing - markings are there; then all of a sudden, the taxiways are black, no markings, and same for the runway. I am not using a very complex a/c just the Mooney.
LG