I saw this! Surely no imaginary squares. It was when I connected my second display (65" Samsung QLED TV) by wire. Somehow the experience was alarming and not good, not a true plug and play.
However, when I switched to wireless AirPlay Display, it works easily and instantly. So I never bothered going back to wired.
But yes, I have seen those pink squares and I hope it is a temporary issue that Apple will fix!
However, when I switched to wireless AirPlay Display, it works easily and instantly. So I never bothered going back to wired.
But yes, I have seen those pink squares and I hope it is a temporary issue that Apple will fix!