Error Message when creating a new post

Hi all,

I have been using WP for a few years without any problem until last week: whenever I try to create a new post, I now have this message displayed instead of the input fields:
“Warning: printf() [function.printf]: Too few arguments in /htdocs/public/blog/wp-includes/class-wp-editor.php on line 148”

This is coming from the function: editor( $content, $editor_id, $settings = array() )

By checking on my FTP I found out that this file had been updated the day before so I uploaded the same file from a fresh download of WP3.6.1 but the problem is till there.

I also updated each plugin after that but without any success.

Something else, the wp-admin page generates an error at runtime, it’s trying to load the following file: wp-admin/dashboard.css?version=3.6.1 404 (Not Found)

If anyone has an idea, that would be really appreciated.

Thanks in advance,

Niko