Unable to write a comment on Facebook

Hello,

I've had a problem on Facebook for 3 days
I can no longer write comments on the site

To be more specific about my problem:
- I write a message or a comment, I hit "enter" and nothing happens, and I get no error message
- I want to like something: it doesn’t work
- I want to view previous comments in the news feeds: it doesn’t work

I've tried logging out, clearing my cookies, but nothing works

I'm on XP and Opera 11.64

Configuration: Windows XP / Opera 9.80