https://community.openvpn.net/openvp...1702f1d0c2019b
After this, let me say that openvpn-applet has been tweaked a lot to manage user/pass authentication and has not been updated since 2010.. I hope someone would continue the development of this applet.
I'm using openvpn version 2.3.10 since some time and i'm going to push it to the autobuilder very soon. I hope it could solve your problem.