All websites, dont show any site on certain date ?!

I have a weird little problem.
On the date 2011-07-04, in the all sites, it doesn’t list any website, the table is empty.
This happen both on Firefox and IE8.

See this screen capture :

Why only this date ? I know it’s a special date in certain countries, but, that’s no reason, isn’t it ?

Do you see any Javascript error in Firefox?