thanks a lot for your reply.
I did a full restart of the dhcp service after the Core 110 update .. and now it seems fine
so this one is SOLVED.
BTW: related to this issue .. I still see the issue on the DHCP server ... I posted this alreadyviewtopic.php?f=27&t=18242&p=105456#p105456
do you know if it was updated to 4.3.5 or more recent?