If you are using FSX in DirectX 10 preview mode and want your freeware addons to display properly, use a site such as FlightSim.com to obtain your addons. There are many addons available that have been converted from FS9 to FSX but have not been fully converted. Although such addons will run in FSX, you will have to run them with DirectX 10 preview mode disabled. Once you have experienced the superior display quality of DirectX 10 preview mode, it's difficult to go back. Fortunately, FlightSim.com has many freeware files available that take advantage of DirectX 10 (including some addons that h