Superuser disabled after Update to 4F8


Ack! Ok, I need some help here... After updating from 2H19 to 4F8, I've lost functionality in the Terminal when using my account (not root - I avoid root!). Ever since the upgrade, I can no longer superuser... when I type SU at the prompt, I get:

su: setgroups: Operation not permitted

Any ideas?
The root account is disabled in 4F8. Go into NetInfo Manager to
/users/root and clear the password (it's set to a *, which effectively
disables the account because it's not a valid encrypted password).
Reboot. Root will now have no password, so you'll want to set one