I've had this working in the past (earlier version of Joomla), but must have changed something and I can't get it work (even in a brand new site). I'm using Joomla 3.4.8, the newest version of JCE, and DirectPhp. I have Global Configuration > Text Filter Settings > Super Users set to No Filtering, and have adjusted JCE Administration > Editor Profiles > Default > Editor Parameters > Advanced > Allow PHP to yes.
Yet, when I save a any article with Php code I get a 403 error. Without the php code it saves correctly.
Does anybody have any hints?