[Plugin: Shortcodes Ultimate] Shortcodes not working, no error messages though

I can’t seem to get shortcodes working. I had it working, but now when I try to insert a shortcode into a post and select it from the dropdown box, I get absolutely nothing. No error message, just nothing. An empty box where the shortcode settings should be.

Any ideas?

http://ww.wp.xz.cn/extend/plugins/shortcodes-ultimate/