Well, in setting up for the screen shots, I found and "fixed" the "problem". It was a user error (blush).
This screen shot shows the problem. All tool tabs docked except the DB Client, which should not float over the others, it should dock when in this position.
This is how it should be, all tool tabs are docked into the pallet at the left side of the screen.
Finally, here is the same screen in "Full Screen" mode.
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The "problem" was that I had turned on View/Freeze Docked Windows, which is supposed to prevent docked windows from being un-docked. "Freeze Docked Windows" does indeed prevent the docked windows from being undocked by dragging with the mouse. HOWEVER, if the title bar of a docked window is double clicked, that will maximize it, as expected. What I did not expect, is that it also undocks the window in the process, makes sense.
But now the undocked window can not be re-docked because "Freeze Docked Windows" is enabled... This had me quite confused for a while

But it's ok now, just turn off View/Freeze Docked Windows!
-Glen