If unable to be upgraded or issues arise may I suggest the offsite paltalk for the chat. It's free to sign up and could save the board money. it is safe and you can make people admins of the room who can bounce and ban people from the chat who don't obey the rules.
The chat we have been using until now did have Admins (the same people who are Admins on this board), and we did have the ability to "kick" people out if need be. However that function never had to be used as we've always drawn a well behaved group of people.