Okay, I found a solution to my problem. The problem is that something in the community folder is preventing A350 from compiling after update. So I moved everything except A350 from the community folder to somewhere else, load up both A350 900/1000 in some airport, i.e. successfully compiled, then put everything back into the community folder. Everything is working fine now. I couldn't be bothered to find out which addon is conflicting, since i have over 20GB of them, but if I ever found it, I'll post here and let you know.