Hi, Ryck.

On my system (10.5.8) it automatically saves your changes & locks itself when you quit Sys Prefs.

I was just about to consider zapping the PRAM when the problem disappeared as mysteriously as it arrived. Very odd...

I looked at the Console logs & there was nothing suspicious so hopefully it's sorted itself.

Cheers, Phil...

2008 15" MacBook Pro 2.4GHz 2GB RAM 200GB HD
OS 10.5.8
1TB Time Capsule
1TB Iomega FW 800/400/USB 2.0 external HD
500 GB Iomega USB 2.0 external HD
SmartDisk CrossFire FW 400/USB 2.0 160 GB external HD
Canon Pixma MP600R all-in-one
Software: Logic, Ableton Live, Photoshop, Flash, Lightroom & BBEdit