Screen flicker when moving through track

I am using Audacity 2.1.3 on a Mac running MacOS 10.12.3. This problem began when I upgraded my computer in 2015 using Yosemite and I hoped that subsequent updates to OS and to Audacity would resolve the issue but it is getting worse. If I am scrubbing, scanning or moving a track the window flickers so severely I cannot see what I am doing and have to guess at where I am. There is also a flash when I start/stop playback. I have not noticed anything similar with any other applications and so I think it has something to do with Audacity itself. This is really slowing me down and any help would be greatly appreciated!

So there you have it. Something specific to your machine. Contact Apple Support. I assume you have already reset the PRAM and SMC?