I upgraded my Mac OS X laptop to 10.2.8 and lost my network settings. I rebuilt them quickly, but had to run “Repair Permissions” to get them to stay. It’s pronounced Mac OS “Ten” by the way, not “ex.”
Of course, I’ve just spent a week upgrading Windows XP machines with Blaster worm protection and numerous other updates, including a modem upgrade that rendered the modem useless.
Yep, this is job security.