Screen Flash Behavior I have an annoying new behavior on my MBP 13" running Lion (10.7.4) that I don't know what I did to provoke.  I am familiar with so-called visual bells in terminals, but I've noticed a similar effect happening in any window in my OS X session - not just in Terminal.  I've researched this and there appears to be a setting in System Preferences -> Universal Access -> Hearing where you can enable a screen flash in place of an alert sound.  However, this is unchecked on my system.

Any ideas how I can correct this?  I'm going to seize out soon if I can't figure out how to disable it...ugh.



EDIT:  In response to the comments/questions below, I have confirmed that the plist also shows this setting disabled.  I'm not sure what the advantage to removing the plist file and logging out/in would be.

plutil -convert xml1 -o - ~/Library/Preferences/com.apple.universalaccess.plist|grep -A1 flashScreen 
&lt;key&gt;flashScreen&lt;/key&gt; &lt;false/&gt;
Do you have your system sound muted or volume turned all the way down?  Even for the non-hearing-impaired the Mac will use visual bells (at least some of the time) when sound output is turned off.