My old 2015 mac finally broke today and I purchased a brand new mac, all updated to newest software versions and now I am having nothing but issues with illustrator.
I used to run CS6 on my 2015 mac with 0 problems, now running CC and I literally cannot do my job.

When I select an item it will not deselect unless I move the screen, If I move an item I cannot see where the item is until I move the screen. I cannot work like this, I use Illustrator to design and set up files for laser cutting and this involves lots of moving of objects.

In the pics attached I have clicked to de-select, but the box or selection stays until I move the art board.

I believe lots of people are having this issue but it still isn't fixed. Please help!

edit - I also cannot close illustrator without having to force quit.