Infinite SEO not responding

Hello For some reason I can't get to Infinite SEO. I go to settings (WP) and click Infinite SEO? This comes up?

HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.

A conflict with something? Anyway I love this plugin and would like it to work again. :slight_smile:

Currently on WordPress 3.4.1

Pat