Mac OS X 10.3.x: Kernel panics upon location change
Yesterday we covered a reader report from Rob Tillyard that his PowerBook G4 has recently been experiencing kernel panics when switching between Network Locations (via the Locations submenu of the Apple Menu or the Network pane of System Preferences). Since then we've received corroborating reports of this issue from many MacFixIt readers.
I see this. No clear workaround except for Apple to fix the problem.