My beige G3 macppc machine hangs solidly in ntpdate after upgrading to 4.99.33.

If I disable ntpdate in /etc/rc.conf, it boot completely to
multi-user. If I run ntpdate either by setting ntpdate=yes in
/etc/rc.conf or just by calling it manually, the machine hangs and
does not seem to answer to neither the keyboard or the network. This
also happens after I rebuilt the system at 4.99.33.

Any explanations ?

regards
- Erik