In summary, the internet be it youtube or blog post can be a minefield and should be ignored unless you have experience under your belt.
The default rule set will start you in a good and happy place.
This is a reference worth reading on vlans.
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
(1) You have no interface bridge vlan rules??
Assuming etherports 4,5 are trunk ports potentially carrying one or more vlans but not delineated.
(2) Why mangle?
(3) Where are your default firewall or ANY firewall rules.
Is the router not your firewall?
According to what you have any vlan should talk to any vlan at layer 3 for any protocol
(4) You probably should provide a network diagram.
(5) Are the WANIPs fixed IP addresses??