I attached a zip of the Content log. I hope I understood correctly.
Yes, I can read it now, and it's so full of errors, that you should be happy your simulator even starts, let alone working without crashes. It "only" contains 1000 errors, because no more than 1000 can be logged so, it's possible there are even more we don't know about.
They are mainly caused by AI with errors in they configuration files, but not only, I can see missing textures from airplanes, missing effects, ect.
I just tried reinstalling both with no help.
If with "both" you mean GSX, it's normal reinstalling GSX won't fix anything, since the problem is not caused by GSX.
The moment I press any service (not just pushback as mentioned earlier) on the GSX menu, the sim crashes. What happens after initiating a service?
I think I already explained where to look for, GSX by itself CANNOT CRASH THE SIM, this is really out of the question. As I've said, GSX hasn't even crashed, it has logged the sim crashed for other reasons, and cleanly exited after it saw that.
In any case, there's a known bug in the sim, that has been acknowledged by LM, which results in the sim crashing when objects are removed, it's supposed to be fixed in the next update, but they have a workaround for it, explained here:
https://www.prepar3d.com/forum/viewtopic.php?f=6312&t=140053&start=90#p229913