You did not attach any files.
First, if you have updated firmware with Keep settings option enabled, I would suggest to delete OVPN instances and reconfigure again.
Next, if the OpenVPN does not start on boot, access device's CLI and execute the following command:
- /etc/init.d/firewall restart
I would also like you to attach a troubleshoot file to your question. Please, replicate the issue, then access router's WebUI, go to System -> Administration > Troubleshoot section and download troubleshoot file from there.