Any Wordpress page containing <form> eg <form><input onclick="history.go(-1);return true;" type="button" value="Back" /></form> causes a wp-admin/post.php "oops that page cannot be found" error when trying to update the page in Wordpress. By removing all <form> elements the page can be updated. As the function works on other hosting sites, I assume it is an X10hosting security issue in not accepting a normal HTML <form> element. I have seen other comments on this but no resolution. Am I right and either way how do I resolve it?