Upon entering any multiplayer game, the first time I hit the "CAPS LOCK" button to talk, the screen will go completely black for approximately 5 seconds, then will resume to normal. All in game sounds and motions are still active and possible during this time.
P.S. This can be re-created at the main menu screen as well.
My config:
Intel i7 3820 3.6gHz
nVidia gtx 680
ASUS P9X79
16 gb ram {F19120} {F19121} {F19122} {F19123}