Did you create and download your opvn client config file along with the certificates from your ClearOS Webconfig, logged in as the user that's using the OpenVPN client utility on the remote machine? If so, I don't how ClearOS would've know the path location for your certificates when it created the script in the opvn file. Did you look in the opvn config file and verify the lines for ca, cert, and key include the path? Otherwise, I would think the OpenVPN client would expect them to be in the same directory as the opvn config file.