Textareas don't work in entry/page editor

Hi,
I’ve upgrade last week. Everything works well –I mean, all the info and links I’ve put in more fileds before upgrade are still in the pages and are still working–, but the textareas in the page/entrys editor don’t work at all. The title of the plugin window in the page/entry editor are there, but I can’t open it and fill in more info in the fields (that not apear).

I’m not a geek so I can’t give u more detailed info. I’m sorry.

http://wordpress.org/extend/plugins/more-fields/