I'm sorry, but this is just wrong. I DID 100% what you said, here is your "guide":
"You have the correct version, the one that doesn't force a cache rebuild after each restart so now, I'm officially outside of explanations, because what you are looking at shouldn't simply happen.
The only thing I can suggest, is a complete reinstall:
- Uninstall GSX from the Windows Control Panel. Reply YES to the question "Do you want to remove the Addon Manager ?"
- Uninstall any other FSDT product you might have, including any for MSFS.
- If the Addon Manager folder is still there after all the uninstalls, remove it.
- Remove all these folders:
Documents\Prepar3D v5 Add-ons\Fsdreamteam Addon Manager\
%PROGRAMDATA%\Virtuali\
%APPDATA%\Virtuali\
Be careful about the last one in %APPDATA%, because it contains all GSX profiles you might have made for airports or airplanes. I suggest making a backup of this folder somewhere else.
- Download the full GSX installer again, and install it. Check if it works before doing anything else. Don't do anything else and report back."
It nowhere says anything about the universal installer or about exclusions. So I didn't do it and reported back, just as you said in your last sentence.
So, yes NOW I updated GSX2 via the Universal Installer AND added the AddonManager folder to the Defender exclusion list. After doing that Couatl seems to start again, regenerating cache after startring a flight, however, the original problem is still the same. As soon as I restart couatl it completely disappears. So no progress here at all.