When a .ovpn profile contains a http-proxy, there is no connection whatsoever with the most-current OpenVPN version 2.3.10. I can see that no packets are sent to the proxy.
The .ovpn contains something like:
remote 127.0.0.1 12461 tcp http-proxy 138.200.33.144 80 client dev tun verb 15 resolv-retry infinite nobind persist-key persist-tun keepalive 20 120 comp-lzo no remote-cert-ku a0 a8 ns-cert-type server
followed by inline key and certs. The "strange" target 127.0.0.1 does not matter. Also, the config works for iOS and Android clients as well as with Viscosity for Windows - and the latter uses exactly the same OpenVPN.exe (i.e. 2.3.10).
WIth 'verb 15', one can see the log I added as attachment. The last four lines were caused by a manual disconnect.
I think this has something to do with the way the management interface interacts with the frontend. Something must have changed in between 2.0.x (for which the GUI was developed) and 2.3.10 - this seems to break things.