Let's not confuse the two issues:
- Runway/textures bleeding, it really looks like a double scenery. Maybe it's just the default popping out for some reason ? That might explain why you had the impression the Trial didn't really "end", perhaps you were seeing the default scenery ? I just checked soon after you posted that message, I assure you that the Trial works: after 5 minutes you should only see the ground and jetways, but no buildings, except from some in the peripheral areas.
- Jetways that doubles when you activate them. This is not caused by another scenery, and I can see this as well. We are investigating, it looks like either we found an FSX bug or undocumented behavior, and it looks like it *might* be related to the complexity of the AFCAD file. We are looking into it.