I think Captain Sim really hit the nail on the head. I'm a payware designer, and I'm working on a scenery. I noticed that the airport in the default scenery is about 100 feet off from the real world position, so therefore, ultimate terrain users will have issues with compatibility. To fix that, I would have to re-make the whole airport to move it. Is that worth it? I think that with the amount of coding Captain Sim has to do, they run into this a lot. Is it worth it? So there may be one or two glitches, but like they said, NOTHING is perfect.

Hope I helped to explain a bit too

Collin Biedenkapp