Originally Posted by WarChild

You're updating inside Wordpress, right?

Try this:

If your new post admin is located at say http://www.SOMEDOMAIN.com/wp-admin/post-new.php manually change it to drop the www so it reads http://SOMEDOMAIN.com/wp-admin/post-new.php. If it's showing without the www by default, then add it instead.

See if it will accept your post like this.