Anytime I try to load up any flight or "go to" an airport in the US southwest the computer locks up loading the scenery.  It works great everywhere else.  Any suggestions???

Thanks in advance,

Jim

P.S.  All the scenery has been working great until recently and I can't think of what I might have changed to cause this.

All my addon scenery is in other areas.  I still haven't solved the problem.  Today I attampted a flight from Portland OR to Phoenix.  Somewhere over Nevada (I think) The ground texture got real blurry and my FPS dropped to about 1 like the whole USSW is missing.  Maybe I need to reinstall the sim....?

Jim