Okay, should ve tested more before posting, but now the 3D Viewport is broken. When i create a box its black in the 3d viewport and when i move the cam around kinda the same happens as before with the grid in the 2D viewports.
E: When i deselect the box everything turns to normal until i select the box again, but when i deselect it and try to zoom in/out in the 3D viewport the whole engine freezes and gives me a "program wont respond".
Edit 2: Just noticed the tons of "Failed to load posteffect: WireframeSelection.fx and Outline.fx"