https://bugs.launchpad.net/bugs/741935 is the link to the ticket. I am running on Windows XP. I can't use the command line in Calibre as every time I open it, it closes within 10 seconds. If I quickly click on something, it closes again within 10 seconds without completing anything. If I can't get into the program, because it keeps crashing/shutting down on its own, how am I to run a command? Also, I am not receiving ANY error messages. Absolutely nothing. It just keeps shutting down no matter what I try. Someone please help! I've now spent days working on this!!