Well, not sure what to tell you but running the updater was the last thing I did and since then, no couatl, no GSX, no controls through FSUIPC.
Just because you ran the update as the last thing *you* do, doesn't mean the update was the cause. There are plenty of background processes in Windows ( like antivirus, that's just one of them ) you have no control over, that can affect and change files without you knowing so, fact it happened just after the update was purely coincidental.
The only thing sure, the FSDT Live Update doesn't touch ANY of the simulator own files.
One thing the updater does ( but it does it since years, nothing new ) is that if you or some other addon has mistakenly set a Compatibility mode for Prepar3D.exe, it will reset to default, because running the sim in Compatibility mode decrease performances and causes all sort of issues, like video driver problems, low fps, rendering issues, etc. because Compatibilty modes like XP or Vista under Windows 10 will force the video drivers to run in a lesser performing mode ( WDDM 1.0 ), not the native Windows 8/10 mode ( WDDM 1.1 ).
The only Compatibility flags we leave in place are "run as Admin" ( if enabled ) and "disable full screen optimizations" ( if enabled ).
That's the one and only thing the updater does to the simulator itself, which is restoring to how it's supposed to run, since by default all compatibility modes are disabled, when the simulator is installed. And the updater always did that, since several years so, there's nothing new or different in this update that might have caused that.