functions.php error

I logged into one of my WP installations tonight and could not search for a plugin in the Add New Plugin page. All searches return NO RESULTS – whether I search, choose featured, favorites, or any of the options.

I noticed where the Tag Cloud is normally located that I have this information instead:

Warning: number_format() expects parameter 1 to be double, string given in /home/athensve/public_html/wp-includes/functions.php on line 155

Warning: number_format() expects parameter 1 to be double, string given in /home/athensve/public_html/wp-includes/functions.php on line 155
1 2 3 h M

I deactivated ALL plugins and changed to Twenty Ten and the error still exists. I am using a child theme of the Genesis framework, but have eliminated it and my modifications by switching to the Twenty Ten theme.

From my research, it seems this has to do with the api not working in the past. However, I logged into other websites on the same server and the issue is not there.

Any help is greatly appreciated.

Thanks.