System Preferences not working


House pianist
Everything had been working perfectly for quite a while, when all of a sudden today I tried to bring up System Preferences, which I'd done many times before, and nothing happened.

No hanging, no other unusual behavior -- but now when I select "System Preferences..." the selection blinks and then nothing happens.

I haven't tried anything more extreme than rebooting and zapping the PRAM. Has this happened to anyone?
I moved my system preferences from the applications folder to the utilities folder 'cause I thought it made more sense in there. Unfortuntaley, you can't get to it from the "apple menu" then. Just move system preferences back to the applications folder and all will be well.