Are you saying the problem is due to lower settings?

In my own experience yes. I have to say I have never come across these
missing bridges, only more bridges than were in fs2002:-)

I had thought that the bridges question had been solved, after the people
concerned had turned up their settings. For example, in New Zealand where
there used to be very few bridges in 2002, there are now in 2004 newer and
better ones and in the right places. I don't know about the USA. I seldom
fly there.