Program window not displaying correctly

Hello

I have a problem with the program window: It doesn't display the footage correctly. when I make the window smaller the preview image becomes smaller inside of it's container and leaves traces. If I edit a graphic (animations etc) and resize the program window, the aspect ratio of my footage changes as well as it leaves these traces.

I also found a third bug which isn't connected with the program monitor: Every time I click in fornt of any footage the timeline turns white.

I've made a video so you can see what I'm talking about. (The language is set to german) Dropbox - 2018-05-12 18-28-18.mp4

I hope anyone can help me with these problems.

PC SPECIFICATIONS

OS: Windows 10

CPU: Intel I7 6700K @4.00GHz

GPU: Nvidia GTX 180 from Gainward

RAM: 16GB DDR4

SSD: Samsung 860 Evo 1TB (Footage and Premiere Pro are located on this drive)

Motherboard: Asus VIII Ranger

PROJECT INFO

I have the latest version of Premiere Pro CC (Installed in May 2018)

Footage: 1080p30 Gopro footage about 1 hour

Sequence: 1080p30, length about 4 mins

FAILED FIX ATTEMPTS

Switched from GPU Mercury playback to CPU (after that the traces were replaced with black space)

Updated graphics drivers

Launched Premiere Pro while pressing Shift + Alt to reset it

Reinstalled Premiere Pro

Tried the same footage in a different project / sequence

Reinstalled Premiere pro on a different drive

Tried different footage