This has been happening recently this week. Sometimes, my games would freeze, and when I alt-tab out, I'm not able to click on anything on my main display. The mouse cursor stays as the in-game cursor. When I move it to my second monitor, everything's fine. I'm not sure what's going on. It's never happened before.
PC:
CPU: i5-3570K
MOBO: ASUS P8Z77-V PRO
RAM: 2x4GB G. Skills 2133MHz
PSU: Inland 750W Gold 80+
GPU: ASUS GTX 770 2GBOC
PC:
CPU: i5-3570K
MOBO: ASUS P8Z77-V PRO
RAM: 2x4GB G. Skills 2133MHz
PSU: Inland 750W Gold 80+
GPU: ASUS GTX 770 2GBOC