I have odoo 9 installed on Amazon ec2 instance running on ununtu 14.04. I secured the website using letsencrypt/openssl and now all of my theme selections are gone. Under "customize theme" menu, it says, "please install a theme to customize tyour website" but when I install a new theme in the "addons" folder and update everything, the theme still does not show up. Any help will be greatly appreciated. FYI, I am also using Nginx as a reverse proxy.