Do you have airport addons installed? Prior to the update some addons disabled the overall ground handling system if they contained a custom AirportServices folder. That folder should contain a compiled Services.spb file inside. If that file is uncompiled (like a xml file or something else) that can be the problem again with SU7. I reported many of these errors to the creators, including some from Aerosoft.
What solved the issue before SU7 and until they patch the addon was to delete the AirportServices folder and remove from layout.json file the entire text block containing AirportServices as well. This block is usually the first in the list inside the json file.
In this report I included an example for LOGL airport. There you can see the details of what needs to be changed. Just go to the third post.
Cheers