@Kovid: I found some odd behavior with tooltips.
Running the mouse pointer over an icon gives me the tooltip. Good. Moving horizontally to the next icon, the tooltip goes away (becomes 'calibre version ...'), but does not come back when I get over the next icon. If I go vertical, then the tooltip goes away and the new tooltip appears when it should.
It seems that you get one tooltip per button group entrance. Exit and re-enter the button group, and the tooltip appears again.
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