No sympathy for anyone that uses vlan1 and further no sympathy for anyone using vlans and has the bridge providing DHCP services. Associate the DHCP services to the vlans and leave the poor bridge alone (so it can focus on bridge ports and bridge vlan filtering) 
Yeah its that kind of hard ass Friday.
If you follow this guide and you still have issues then the firmware is really borked!!
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
(yeah the wiki sucketh)