1.9.1 ERL: DHCP server stopped updating DNS servers

Hi,

after updating my ERL to 1.9.1 the DHCP server stopped updating the DNS server, which resides on a different host. Prior to the ERL update, it worked like a charm. I'm quite certain that I didn't change any config on either side, rebooting both didn't help. Here is my relevant config.

 dynamic-dns-update {
     enable true
 }
 global-parameters "update-static-leases on;"
 global-parameters "zone my.domain. { primary w.x.y.z; }"
 global-parameters "zone y.x.w.in-addr.arpa. { primary w.x.y.z; }"
hostfile-update disable
use-dnsmasq disable

The DNS server allows updates based on IP address. The logs on the DNS server don't show an attempt of the DHCP server to send anything, neither do the logs on the ERL.

Any ideas?

Thanks

Marcus