Yeah this had me puzzled for a while. Basically, I configured the OpenVPN client correctly (I thought so anyway). When I attempted to connect to my server, both the in-App log window and the log of my server remained empty: From what I could tell, OpenVPN didn't even try!
Well, it turns out that as of early December 2013, OpenVPN Connect does not work on 64bit architecture on an iPad or an iPhone. The developers expect an update in mid-2013 to fix this. So until then there is nothing that we can do about it. Too bad.
Update: Problem has been fixed in current versions of OpenVPN Connect.