I'm trying out ID CC and opened an ID C6 file to test. There are grey bars that appear randomly on screen. Not in fit in window view but in any other view when zoomed. Please see attached screen shot of the grey bars.

I'm using a 13" MacBook Pro (2017) with 16GB RAM. Under preferences, Display Performance is set to default and CPU Performance shows Compatible CPU and Monitor Detected.

How to resolve this?