Active widgets empty in admin area

Hi guys!

My admin WP widgets area show my 3 active widgets empty of content and eveything else but the titles of the widgets.

Eveything else is fine, including the other non-active widgets.

I cannot drag them, delete or modify them in any way.

Also, they appear to be lower (like CSS lower) on the page than the other widgets.

I’ve been having this prob since 3.1.3, but thought after the upgrade will go away. The little devil hasn’t and my knowledge of WP is limited.

It’s basically the same problem from here: http://stackoverflow.com/questions/5940833/wordpress-widgets-are-disappearing-in-admin-area – wich hasn’t recieved an answer just yet.

And here’s a screenshot with the problem: http://www.piatra-neamt-cultural.ro/pncwidgets.jpg

Any help appreciated.

Active plugins (all of the active before the prob appeared)
*AdCaptcher
*Akismet
*All in One SEO Pack
*Do Follow
*Google XML Sitemaps
*Limit Posts
*number of view
*Page Links To
*pageMash
*SimpleModal Contact Form
*Subscribe2
*TentBlogger SEO Categories
*TinyMCE Advanced
*WP-UserOnline

Active theme: don’t really know, it’s a modified one with lots of WP tweaks (all of wich were made in Juanuary – February 2011, the widgets prob wasn’t there at the time)

Many thanks!