Computer freezes in kbna area

Hi allRecently tried to fly two flights from KMDW-KTPA using a Southwest and Westjet repaint with my Ifly 737. On both occasions I have a complete screen freeze with no error message from FS9. Also the event viewer does not come up with anything either to indicate what the problem may be. I at first thought the problem may have been the Southwest repaint hence the flight in the Wesjet livery. I have also run Filemon recently and all my AI aircraft appear to be fine.The aircraft was on a heading of 155 leaving PXV VOR and the freeze happened 72 miles from BNA on the last flight.I have noticed a scenery problem at the threshold of runway 2C it looks like a lump of forest has been dropped in the built up area, could that be a problem?Any help would be appreciatedRegardsNic Jackson