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Thanks, I missed that completely.

My first search in PS led me to this:
Troubleshoot Adobe Photoshop problems, issues, or bugs
Setting Font Preview to None seems to have fixed this issue.
...

What is it's in It's getting my Alt-Tab items stuck
and
What thing in this thing gets stuck in the middle

Try the left or right Alt + Tab combo - if one works and not the other clean the Keybd...