League Screensaver problems

league screensaver worked for me before and when an update came out i thought i had to re download it. So when i re downloaded and try to start it back up an message would pop up saying league screensaver had stop working and when i let my computer sleep with the league as the screensaver it would turn my computer black and when i move the mouse it would log me of my computer. Please any advice or solutions would be really great. BTW i have a window.