I'm scared to download it
What I would suggest for those who are experiencing problems is to download and install manually the Combo Update. Apple - Support - Downloads.
Just make sure you unplug all peripherals, quit all apps and let the installer do its thing.
Just tried this....still doing it. It doesn't seem like it would be my speakers since it only started happening right after I installed this.
Same here.
Also, we're not the only two.
http://discussions.apple.com/thread.jspa?threadID=1005162&tstart=0
Funny thing is we both have a Mini and I can't get mine to do it no matter what. Are you using External speakers?