Feed not found

Hello, I’ve installed Alpine plugin for both Instagram and Pinterest. My pictures are unfortunately not showing up. I’ve been through the authorization process, have activated, de-activated and re-activated the plugin several times. I get the same message for both plug-ins : “feed not found”.
I’ve contacted my hoster (HostGator) as suggested in one of the FAQ. They don’t seem to find the issue either and refer me back to you.

Would someone have any idea what the actual issue could be ? Yesterday night, the pictures did appear for a few minutes and then just vanished. Of course, between the appearance and the dissapearance, I didn’t make any adjustment. It just happened.

My blog : http://www.fashiongeekette.com

I really like this plugin. I saw it working on other blogs and for a few minutes on mine. I really would like to use it.

Thanks in advance for your help.

http://wordpress.org/plugins/alpine-photo-tile-for-instagram/