page not found when updating pages containing images

Hi,

Since upgrading to 3.5 i have been unable to update any pages that contain images. instead i jest get sent to a “page not found” page with http://www.360p.co.uk/wp-admin/post.php in the address bar.

If i remove the image the page will update fine

my sites URL is http://www.360p.co.uk

Any help would be appreciated.