Hey there, I've been playing Air Hauler on FSX for a while now, too. I had the exact same problem you did. If I play just FSX, I have the FSUIPS4 thing. It has the menu and all the add on stuff on my tool bar. However, when I play Air Hauler, it says I don't have it installed and it gives the same problems you had. Did you ever find a fix for it? I'm anxious to hear. Thanks for your help!