qTranslate & current-menu-item

Hi. I’m using this awesome plugin in my website for 3 languages. I have 3 different Navigation Menus for my 3 languages.
The current-menu-item class only works in the default language (English).
My permalinks are like this:
For En: http://www.site.com/ — http://www.site.com/about-us/
For Persian: http://www.site.com/fa/ — http://www.site.com/fa/about-us/
For Arabic: http://www.site.com/ar/ — http://www.site.com/ar/about-us/

http://ww.wp.xz.cn/extend/plugins/qtranslate/