With mesh, you do not need to enable ethernet bridging at all. All the traffic should tunnel back to the WLC as if the mesh ap was a local mode ap. Make sure that if you are using AP Groups that the WLAN to vlan mappings are correct. The other thing is that you should be on v188.8.131.52 and also make sure you have uploaded the latest FUS 184.108.40.206 onto the WLC for stability. I have mesh networks on both v220.127.116.11 and v18.104.22.168, working just fine.