Thank you Mike!
It was the Hardware Acceleration / OpenGL.
The problem was i couldn´t deactivate the Acceleration in the driver settings menu. It was greyed out.
The Inteltool-update-tool told me i have the newest drivers!
But it was a custom driver by Lenovo.
So i installed the newest Intel driver which tolds me there is a newer version of the driver on the pc!!!
But i did install the intel driver. After that i had the possibility to deaktivate the Hardware Acceleration.
Colors came back and editing was possible in PP!
But with Hardware-Acceleration disabled my VLC now shows blocky video! Arrggghhhhh
Computer Nightmare continues…