Same here, 2020.5, Mac OS, I had thought it might be the ProTools update, so I reinstalled 2020.3, but same issue.
However, there was also a recent Mac OS security update, though I did the security update two days ago and didn't notice this behavior until today:
https://support.apple.com/en-us/HT211170
I'm on 10.13.6 so that might narrow it down to some of these fixes listed in there?
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