You do realize this is just a public forum, manned by volunteers, and the occasional OpenVPN Technologies Inc. personnel member, right? And not the official support ticket system? If you want a speedy response use the support ticket system. Sign up at
www.openvpn.net and use the 'support' link at the top to reach the support ticket system.
Regarding your question: you need to use packet capturing like tcpdump, and the ping and traceroute commands, to track down exactly where the traffic is being stopped, and then fix it there.