Grr. Installed another
and yet again the
networking has stopped working
This has happened every time I've installed an OS update; the problem seems to be related to
after a few reboots I get the dialog about
AirPort needing to access the system keychain, and after that everything recovers. Another
data point supporting this theory: the Keychain Access program (in Applications/Utilities)
sometimes hangs as well.
Four reboots later, the problem has mysteriously fixed itself (and without the airport system keychain dialog
this time). I was just about to try some more
solutions, but I guess I'll save them for the next time around.