Progressive Runway, Golden Gate Bridge

My question is..why does the progressive runway flash once and then disappears. In FS4, it always stayed until I closed it. I like to be able to taxi to the proper gate in FSX.
And...
Why does the Golden Gate Bridge disappear after dark. In the daytime, it is there but when it goes into night...poof, it's gone. FSX

Chuck

I have never experienced any issues with the guideline; it only disappears once I get to my destination. As for Golden Gate, I have never witnessed it disappear. My guess is that there is a scenery bug. Or, perhaps, it might just not light up, although I doubt that is the case.