Error 406 - Not Acceptable I keep getting this error...

[overture 0]

Hey, i seem to be getting the 'Error 406 - Not Acceptable'. I get this message when i use my shoutbox editor, when i click 'Edit', it is supposed to display all of the message details - name, date, website and message. Before the server went down everything for my site worked fine, but i seem to be getting this message and it wont go away. I made the editor so i didn't have to log into my cPanel and phpMyAdmin if i wanted to edit or delete a post.I would really appreciate if someone could help possible an admin or someone who might know what is wrong with the server, or any problems that have arised after the server went down.Thankyou very muchoverture.