Error publishing posts: only appears title, not body

Hi!

Since two months ago, when I write a post and click Save (idem with Preview), only shows the title, not the body of the post.

¿Any orientation to begin searching?

Thanks in advance.

What's the url of your blog?
What version?

If this appeared without you doing anything special your site might have been hacked.

Hi again!

Hacked???? :-S
I expect it would be easy to rescue.

blog URL: http://www.vandaluces.com
b2evolution version: 2.4.1 (I tried to upgrade months ago, but couldn't reach it-problems with mysql)

Thanks a lot for your help.

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