Part of viewport not refreshing
Hello!
I couldn't find anything on the internet concerning my problem. A part of the viewport is black and doesn't refresh when I pan around. Here's a screenshot. This is only one blue rectangle on the artboard. It doesn't refresh properly.

One thing I managed to work out is, that this happens only if the viewport width is somewhat over 2000px. So if you make the program window smaller you can work properly with it. But that's not the definitive solution in my opinion.
I'm having a macbook pro 15" late 2016, Radeon Pro 460, macOS 10.13.4, Animate is updated to the latest version.
