I have the same problem with Mint 14 64-bit / KDE. It cost me 8+ hours of work (work on virtual machines that cannot be saved mid-point and has to be restarted), and now the installer I have to repeat for a virtual machine isn't working. My temporary fix was to remove the power button from the computer. Shutting down someone's computer without proper reason is a most severe bug that should be fixed immediately.
I have the same problem with Mint 14 64-bit / KDE. It cost me 8+ hours of work (work on virtual machines that cannot be saved mid-point and has to be restarted), and now the installer I have to repeat for a virtual machine isn't working. My temporary fix was to remove the power button from the computer. Shutting down someone's computer without proper reason is a most severe bug that should be fixed immediately.