Hi -
Sorry, I wasn't sure what constituted 'newer.'
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Btw.: IANA has assigned port 4305 for the newer versions of Batman. _So if you are going to update to_ Experimental or Beta open the firewall for udp ports 4305 and 4306 instead of 1966. 4305 is for protocol messages, 4306 is used for tunneling traffic to the gateway. If you want to use the VIS server, open port 4307 also.
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Which interfaces did you (or the system that you have installed) assign to br-lan? You shouldn't assign a interface to batman twice (by itself and as part of a bridge)