Problem after Up date v 3.5.2 installation

Yesterday I automatic up dated wp v 3.5.2. After that Ninja forms Lite fields panel control did not function. I can not make changes to the forms I have in my site.
I have already desactived plug ins and it does not function either.
Do I have to re install wp?
My site is
http://www.cedintrading.com.ar/wordpress2/compra/