Yes, but I'm seeing a "double typed" (overtyped label?) text superimposed on the topic list column when the mouse pauses before selecting the thread.

That is very distracting, and did not happen before.

Maybe a "pop-up" (hint or thread summary) that doesn't blank out the text behind the popup?

(Note: This occurs to me when the thread is selected from the "Active threads" list, after selecting 24, 48, or 72 hours.)