I too have this problem. I just bought G3 and installed it an now my add-ons won't work. Keeps telling me to insert the disc after it just finished installing the program from the disc. I even tried moving the planes from the folder in G2 to the G3 folder but the planes are not showing up in G3. The Great Planes techs are about worthless. You would think they would want this fixed but all they want is the name of your great grandmothers maiden name to prove you paid for the program (which I did). I have almost $600.00 invested and they won't help me until they do a DNA test.