After I tried everything that I can, I'm posting on here.
The main error is GSX only recognizes terminal 1 with no spot in KJFK v2 on "customize airport position".
even though it recognizes terminal 1 only, it is prompting GSX control menu when I keyed in (Ctrl+Shift+F12)
after selecting any services, GSX menu totally blanked out.
not possible to close that GSX menu.
"customize airport position" tool tells me that AFCAD in use is located in
C:\Program Files (x86)\Lockheed Martin\Prepar3D v3\fsdreamteam\KJFK\scenery\KJFK_FSDT.BGL
the weird thing is this error only occurs at FSDT KJFK v2.
same error with all aircraft that I have (PMDG B737, 777, Aerosoft Airbus series, iFly 747-400v2, Etcs.)
I also have FSDT's KLAX v2, KMEM, KDFW, KORD, PHNL, CYVR and those are working perfect with GSX.
--------Things that I've tried to fix--------
I tried to uninstall KJFK v2 and GSX and reinstalled it. (For more than 10 times with different installation orders)
I tried to reformatted all my Computer and freshly installed. (surely twice)
I tried to manually add it to scenery library.
I tried to change orders in the scenery library.
I tried to swap the AFCAD to third party AFCAD found on avsim.com (it allowed me to use GSX in this case, but little off position and not possible to use jetway function)
I tried to see if there are duplicated AFCAD with airport scanner, but it came out with appr_KJFK.bgl and KJFK_FSDT.bgl which I've found on this forum which says normal.
nothing really worked out.
I'm currently using P3D v3.4 with Active Sky Next.
KJFK Scenery by itself works really fine, great details.
But not working with the GSX makes me really sad.
Please help me out with this..