What is causing operation not permitted?

[Maurice R Volaski]

Since upgrading my funtoo box with openssh-7.1_p2, I am able to login (as maurice) but am getting the following output in the terminal

initgroups maurice 20: Operation not permitted
ssh_keysign: no reply
key_sign failed


This is what the debug log shows:
debug2: userauth_hostbased: chost ussflux.fios-router.home.
debug2: ssh_keysign called
debug3: ssh_msg_send: type 2
debug3: ssh_msg_recv entering
debug1: permanently_drop_suid: 501
initgroups maurice 20: Operation not permitted
ssh_keysign: no reply
key_sign failed
debug2: we did not send a packet, disable method