@ralph, of course all overlays are disabled.
Here some things i noticed. If ac4 is started with elevated rights as admin,, it wont even start without vorpx.
So i start ac4 (no admin rights) If vorpx is active the game asks me to veryfy the game path. I need to pause vorpx watcher then i can start ac4. Ac4 starts and vorpx screen shows attaching to AC4SP.exe. But this vorpx screen stay forever and the game seems to launch on my main screen. All i got is in cv1 is the sound of the game.
So no success at the moment. Any more ideas?