I came into work this morning and found that my locations and network preferences had totally disappeared. I could put them in again but as soon as I close the System Preferences they go again.
I thought it could be connected with a file called com.apple.PrefPane.Network.000a9590198e.plist which seems to disappear, but replacing it doesn't solve the problem.
I'm OK as long as I don't close system preferences.
Running OSX 10.2.6 on and iBook 900Mhz with 384MB.