Stupid me that I didnt look there. I thought, its not seeing any playback, so nothing in the logs. But there is some info!
12:55:35.701 [E]: VideoPlayer: access is denied, SVP is running @power while video player is running @power(Adm)
So it has something to do with the user accounts or something.. Any idea?
And solved! I'm running SVP now as Administrator. And its working! Thanks for your help!