(Also posted in the Bug tracking section, my bad)
From source tarball AddDruidContact.cc tries to use AUDruid_serach_agent_lbl which is bad because it's not defined and Gabber dies because of an assert.
Changing line 530 of AddContactDruid.cc from:
makes it work again.
(Oh, and I can't seem to stay logged in in the section... strange...)