AB beta 19 didn’t work for me. Try version 16, that one is the one that worked the best for me. Post more details like cards, type of memory, your OS, and other info so we can see what else it could be.
3 x Aorus 4gb RX570 - Hynix memory
3 x MSI Armor 4GB RX570 Hynix\Elipda(sp?)
Version 16 wasnt working, hence I went to Beta 19. Rolledback to the block chain drivers and somehow managed to get an additional 6mh/s out of my rig so will leave it.