Most likely the same thing that happened to me... please check your aircraft.cfg section [exits], if there are entries in FSX format not FS9...
example: (skyspirit 767) - might be commented or not syntax is percent per second, 3 coordinates, type (0=main, 1=cargo)
[exits]
number_of_exits = 2
exit.0 = 0.10, 73.7,-6.0, 7.5, 0
exit.1 = 0.2, -33.0, 5.85, -6.0, 1
exit.2 = 0.10, 6.0, 1.0, 3.0, 0
exit.3 = 0.09 , 6.0, 1.0, 3.0, 0
Older FS9 configs are different
Regards
Torsten