I can't use GSX pro many airports like Flytampa EHAM even if I disaple all the AI traffic. I don't see vehicles or they are broken like my pictures I shown. So this is completely useless addon to me
I'll try to explain in the simpler way:
suppose you used GSX for a long time before buying Flytampa EHAM (or other very large airport with tons of objects), so you never had problems before. Then you buy FlyTampa EHAM and, suddenly, you see GSX objects starting to disappear. Would you then say "Flytampa EHAM is completely useless addon to me" ?
That is to make you understand what a global limit is: EVERY add-on you have contributes to it, so you must act on ALL of them to reduce their individual contribution to reaching the limit, it's nobody's fault, it's a simulator limitation.
Of course, all of this is explained in the manual, Page 94, the paragraph named
Missing objects, which clearly explain which kind of objects affects it, and what you can do in GSX to reduce ITS OWN contribution to the number of Simobjects.