FREEZE of FSX when loading a FlightPlan?

FREEZE when loading a FlightPlan?I more often than not have a FSX that Freezes when i want to load a Flightplan. I have to Log Off and On to stop FSX and restart.The Directory Tree shows, but it freezes after about 3 second. I saw someone else mention "load really quick" :( but is there a reason why it does this?All else seems to work, after a lot of trials I have FSX working and on a notebook connected ASX, FSInn etc.Running E6600 / 8800GTS640MB on Asus P5N32 Plus and cannot see a reason why it should crashNo other program has File Open problems.??thxMT