How do I Block Private Messages originating in chat room

I have rules in place to drop ALL messages from Group A to Group A.    (Packet type ANY)    Chat should only occur in provided chat rooms.  

They appear to work if a user tries to send a private message from buddy list or search by JID then send message. 

However I believe some users have found that if they click a user within a chat room, they are still able to private message; despite belonging to Group A (drop ALL) from Group A.   

I have been creating specific rules to drop specific user to user messages but this is time consuming. 

Version:  Openfire 3.7.1    Spark Clients:   2.6.3     Packet Filter Plugin:  3.0.1

Please help guys.  I feel that I may be doing something wrong.   

Just a note:  a predecessor once had spark clients installed.. different versions.  Could old spark configs/files cause this? 

Thanks, 

Jeraphim