Hi, I am new here. I am very experienced in FSX, landed using the ILS approach hundreds of times without any problems. However, after I added some add-on scenery using Airport Design Editor X (to fix ILS offsets), everytime I am established on the localizer (starting to descent automatically), I get a continous irritating beeping warning (is it the flap warning?), after setting flaps to full, lowering the gear and reducing airspeed to 150 knots (using the stock 747). Then when I am very close to the runway, I get a "too low terrain" warning and it hovers above the runway for a while before landing. As it lands, I cannot use the reverse thrust (the keyboard is assigned, tested it before take-off) but only the spoilers. Worse still, the beeping noise is still present, even at 0 speed with parking brake on! Please help! I think there might be a corrupted file in the directory, but how to fix it??? Thanks in advance!