I'm using WPML for my danish/english website at http://www.dejligt.com, and I'm experiencing a conflict with WP Super Cache which means, when caching (specifically "super-caching" which needs rewrite rules) is enabled, I get a 500 error when visiting the website.
Does WPML create custom rewrite rules? If so, it seems like they're conflicting with WP Super Cache.
Point of note, the website uses some heavy modifications to run ajaxified. It is entirely possible that is my own doing that has broken the caching.