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I'm seeing a bug here in the Edit Book application when dismissing panels/windows that are being shown in an application-modal fashion. (I'm on OS X 10.9.4, running calibre 1.206.1).
For example, I'll choose Tools > Remove unused CSS rules, which brings up the "Remove unused CSS" dialog box with a Cancel and OK button, where I click OK. Then after doing its work, it opens up a window (no title) that shows the results of process, and this window is shown in an application-modal fashion (meaning, I can do nothing else in the application until this window is dismissed). There is a Close button and a See what changed button. If I click on the "See what changed" button, it brings up the "Differences between books" diff window. Clicking "Revert changes" in that window dismisses the window (closes it), but the rest of the application now still behaves as if it's showing a modal dialog: clicking anywhere on the main window results in an NSBeep, and the menu items are all grayed out. The only way to recover from this is to Press Command-Q or choose Quit from the application icon in the Dock, where you're prompted to save changes or discard.
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