Actually, the solution you provided allowed me to get of both
the topic tooltip hovers in the TOC and the book hovers.
But the root of this one is getting rid of this: when you
stick your pointer in the TOC, and don't have it over any topic or
book, hit F5 to refresh the browser window, then move the mouse a
little, keeping the pointer in the blank area. Right there on that
blank area of your TOC next to your pointer will be a little
tooltip that says "toc", all lowercase.
You may have to refresh a couple of times, as it seems that
there's some kind of pattern that doesn't make the tooltip appear
each time.
It will appear every time you go to a screen that makes the
TOC disappear, and hit the back button to go to a screen with the
TOC displayed, and then quickly move the mouse into a blank area of
the TOC.
That bugger is the one I'm tryin to nab.