Fedora 17 screen blinks on beep

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http://forums.fedoraforum.org – Hey guys, there appeared a problem with my Fedora 17 (3.6.9-2.fc17.x86_64), quite a fresh installation (1 month), but I'm almost sure it wasn't there from the beginning. The problem is that when the system beep sound plays (e.g. when you press Tab in terminal while there is more then one option to be filled in), my screen once shortly blinks in black. It does not depend on the application initiating the sound. I tried to turn off the alert sounds in system sound settings (System Settings - Sound - Sound Effects - Alert volume). The result is strange - since then the sounds are not played eve (HowTos)