I just purchased the Studio 13 Suite upgrade and installed Movie Studio.  It freezes basically immediately on the splash screen for a moment or 2 with the display "Creating File I/O Manager" and the progress bar is not moving.  It eventually fails - sometimes a get a generic Application has stopped working error, sometimes Studio just disappears.  Studio 12 still appears to work ok.
I am running the 64 bit versions of Studio 12 and 13 with Windows 8.1 .   Latest updates are installed for Studio 12 and Win 8.1.  16GB RAM, I7 CPU, Nvidia v 331.82 driver with an ASUS P8z68 motherboard. OS & app is on 1TB C drive that is defragged.  Running as administrator makes no difference, de-installing & re installing as administrator made no difference.
Any suggestions?
Dave