with GSX installed some FSDT airports gates will not close to the Skysim MD11 Aircraft. I am not having that problem wit any other aircraft
As explained, countless of times already on the forum, and of course on the GSX manual:
GSX doesn't control, doesn't interact, doesn't write, doesn't affect and it's not affected by Jetways in every conceivable way!
Jetways will continue to operate as they always did before GSX. So, anything you see with Jetways, has always been like that, and hasn't changed because of GSX.