Comments issue

Hi there,

I have a pressing question regarding the posting of comments.

On my website (http://www.peanutsplayground.com) it just sort of stopped being possible all of a sudden.!

I’ve been toying around with some plugins during the weekend (inline Ajax comments for the main page and preview comments). But had no trouble at all posting comments more than a day later. Suddenly, overnight it just stopped being possible.

I’ve tried deactivating all of my plugins and reinstalling them one at a time.
I copied new versions of every piece of php having to do with comments (in WP-admin and in my WP-content) but no luck there either.
Deinstalling the Ajax comments doesn’t help either. It does not seem to be the evil-doer here.

Any help would be much much appreciated!

Thx in advance!