I purchased the 737NG, 800/900 and 747 as well, last year. I

Search for FSUIPC.exe in your computer and remove everything else except the one in FS9modules folder.I am not saying that is the issue. but that could beManny

I think you mean FSUIPC.DLL. You can verify the version of the DLL in the FS9 modules folder by right-clicking the DLL, selecting "properties", and going to the Version tab.- Bill