So I ran through the "Creating a New Password page (Interactive Tutorial)" for Security Assist and I found something interesting on your video that does not jive. Check out the screen shot I took of the last step of the update wizard. You will see that one says "isset" and one says "session" they do not match. I assume that the form element for newPassword is required not the session variable but now I am not sure?
Please see the attached video mistake: