It was strange that Calibre was the only QT application that did not take the current ubuntu theme (GTK in this case). I played with a virtual machine, installed QT4.5.2, compiled gtkstyle, and still no luck.
And then... after replacing the libQtGui.so.4 shipped with Calibre, it is all back to normal... Calibre and GTK seem to get along.
Cheers for your help.
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