I found a file named kmia-yerxo - and in it states
That's not the file I was referring to. You found this file INSIDE the GSX sub-folder of the folder that is supposed to contain the Couatl.LOG file that will be created IF you enable Logging from the from the "GSX Settings" menu. This file, instead, it's just a GSX customization file you created for that scenery.
As I've said, enable Logging from the "GSX Settings" menu, then exit FSX, restart it, and then check the parent folder, which is %APPDATA%\Virtuali, that should contain a Couatl.LOG file, which might indicate a possible problem with one of your scenery file/folders.