Hi, I'm having an annoying issue with the AutoCAD Lt 2020 version on my Mac. Whenever I move, edit etc an object, there's a trace left behind that doesn't go away unless I pan or zoom. I'm using it on a MacBook Pro 2019 with updated specs. My old MacBook Pro could run the full AutoCAD version without any issues so I'm struggling to understand what the problem is. 

I would really appreciate some help. I've attached a screenshot of what's happening. I dragged down on the middle grip and the old shape stayed behind. 

Also if anyone has any ideas on why I can't click and drag an object that would be amazing. At the minute I have to right click - move to move the object which is quite cumbersome. 

Thank you