Change Tracking hangs

[seasoned_geek]

Noticed this on Windows 10 with professional TextMaker 2021. I'm reviewing changes from an editor. If I have to pull open a browser, or look at an email because someone called, etc. causing TextMaker to not be the top level full screen window for 5-10 minutes, it's hung when I get back to it. I can right click the TextMaker icon in the bottom Windows bar and choose close. I get prompted to save the current document just fine, but there is no place I can click in the editor window to bring that window back to life. It's just refusing all input.