Still doesn't work with above configuration (first post).Seems like this got fixed with 7.2rc3
/interface/bridge/vlan
14:46:49 system,error,critical kernel failure in previous boot
14:46:53 igmp-proxy,info starting IGMP proxy forwarding
/system reset-configuration no-defaults=yes run-after-reset=myexport.txt.rsc
:delay 20