ARP "reply only" not working

anyone there? i keep posting that i have 2 MT 3.7 and when i set the interface to reply only is not blocking the new Ip entry and people keep using my internet.
any one helpppppppppppp.

best regards

I downgrade to 3.6 and ARP is working again now.Mikrotik guys u should fix this arp bug in 3.7

best regards

please write support(at)mikrotik.com

before i write to them i most know if anyone of u had this problem.
best regards