FS2k2 default grass texture has problem?

If anyone cares to verify or comment...The grass texture as used by default at KROC (Rochester NY) is replaced temporarily with a "lit" or city type _LM texture just at dawn and dusk, at night the textures is completely dark like it should be but at dawn/dusk is very annoying. Anyone else see this at other airports or have a clue how to fix?Thanks.