Hey,
I made todaa small flight and could use GSX normal without trouble. Then I installed cartayna airport files. First for Munich and then for 2 other airports. Now I wanted to test it but it always says it can not find a valid AFCAD. Even on other airports. I did not chance something on the scenery, only added the files provided by cartayna and his package.
I deleted all GSX config files but no success. It also says "generated airport cache with Failures".
EDIT: After another restart it seems basicly to work but for example at KBOS the file is not providing the new gates shown in the readme.