calibre 2.0 system tray icon missing, cannot quit
After installing calibre version 2.0, the "system tray" icon is completely missing dispite the fact the preference "Enable system-tray icon" is selected or re-selected and calibre is restarted.
This is a major inconveneince because calibre does not maintain any window presense when the main window is minimized. Once the main calibre window is minimized, calibre is completely inaccessible from the GUI.
Furthermore, it is no possible to close calibre from the GUI without the tray icon, so it is now necessary to use the command line to close calibre.