most of my installations have been update from 2.0-Beta -> 2.0.1 -> 2.0.3 -> 2.1 -> 2.1.1 -> 2.1.2 -> 2.1.3
as far as i can tell, there is nothing wrong with your openvpn configuration.
for testing you could add a firewall rule on top of the openvpn-tab: PASS, PROTO:all, source:any , dest: some-lan-client-address, logging:on
see in logs, if it shows up when you try to ping the client … if it does, then i'd say it's a client issue. If not, then only packet-captures could help to explain what is happening