My name is Mercedes and I am from WPML team. We have received a request in our support forum to check on the compatibility with Advance WP Query Search Filter. You can see it here http://wpml.org/forums/topic/limit-a-result-page-to-the-active-language/#post-318311
Let's work together in solving this problem and making your plugin compatible with WPML.
Could you please drop me a line back?