[Plugin: Relevanssi – A Better Search] Stop Working

I have Relevanssi for about a year and it worked well but suddenly stop working.
http://www.animcentral.com/?s=claymore&post_type=manga
lead to 404 !!! but before it worked well.
http://www.animcentral.com/manga/claymore
other post types too.
http://www.animcentral.com/?s=claymore&post_type=animes
http://www.animcentral.com/anime/claymore

please someone help me here, i really need search options.

http://wordpress.org/extend/plugins/relevanssi/