Hmmm. Compiz?
I don't think that it's Compiz, but I am using it. I start with xfwm4 and then do a simple startup compiz --replace via autostart that may be happening before Calibre launches.
(I've tried several ways to make Compiz start instead of xfwm4, but none of them worked. XFCE seems to insist, somehow.)
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