I'm sorry but, the scenery it's obviously the same so, if it worked yesterday, it should work today. If it doesn't, something else has changed in your system.
Are you sure that your antivirus is ignoring the FSX folder ? And, are you sure that when your antivirus is ignoring a folder, it automatically ignores everything, including subfolders ? If you aren't, try to specifically exclude the bglmanx.dll files in the FSX root folder, and the Couatl.exe files in the FSX\Fsdreamteam\Couatl folder.
Also, if the scenery doesn't work at the first try after you just trusted the modules, this is normal and it's a known FSX problem. DON'T uninstall and reinstall, just launch FSX again and, eventually, reboot Windows once.