I thought the GSX trial worked with all FSDT airports. I own all of them so I thought I would use the trial awhile to make sure I want this product. In KLAS, the only option I got was to open GSX trial mode, which asked me to move to one of the 3 non FSDT airports or open up McCarren options, which has nothing to do with GSX. I even restarted FSX, updated GSX, and changed to a default FSX plain. No changes. I have used GSX at some of the FSDT airports before. What could be causing this issue?