Image wil not insert

Hi

Since two days i can’t insert a image with Fancybox for WordPress.
I select a image from my library and click on insert image but nothing happens.
I tried several things like deactivate but nothing seems to work, i’m using WordPress 3.5.1

Has somebody any idea ?? http://www.funnykareltje.nl/

http://ww.wp.xz.cn/extend/plugins/fancybox-for-wordpress/