Did you follow this for vlans…
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
if not be sure you do.
Also state what MT you have and finally will need a copy of the config, once you applied the learning from the article above.
/export file=anynameyouwish ( minus router serial number, any public WANIP information, keys )