Help! I lost my night lighting in FS9.1!

Suddenly I have lost my night lighting in FS9.1. Whenever I fly at night now, the game decides not to load certain textures around me. For example the VC is completely black, I cannot see any textures except when I press L and the lights light up the gauges but thats it. This happens in every single airplane I've tried now and I cannot figure out whats going on! Help! I have a p4 3.4, windows xp, 1gb ram, fx5950 ultra, sb audigy 2.I have screen shots to show the issue I am having suddenly since a week or so ago. This is with any airport I've loaded and any airplane I've loaded. Help! Thanks!