maybe this can help
http://forum.mikrotik.com/t/swithing-without-master-port/95495/10
from another topic this tip can help:
when setting ingress vlan (untagged vlan of the port) be sure to include that “0”
example
/interface ethernet switch ingress-vlan-translation
add customer-vid=0 new-customer-vid=20 ports=ether03 sa-learning=yes
without that “0” tagged vlans on the port will not work
also check the unicast forwarding database to confirm vlan behavior