I can confirm that after the big GSX update, my windows in KLAX were fixed as well. Something definitely changed.
Sure, maybe your firewall/antivirus might have decided (or you configured it correctly) not to block any files. But I assure you we haven't changed anything on KLAX in this update.
Note that, with "this update", I mean the latest one, released August 6th. In the previous "big" one, the PBR udpate, released June 30th, we have changed two files at KLAX, the AFCAD and the GSX customization. None of them could possibly have any effect on any of the buildings or their textures.
The last time some of the KLAX 3D objects were updated was in September 2018.