Setting Slug and Optional URL disabled in Master on Heroku

[desinle]

This is rather weird thing that is happening with my obtvse install on heroku - Setting Slug and Optional Url in the Post page is missing in the admin backend... I have checked and updated the latest copy...

It works in the development environment on my Laptop, but when I deploy to Heroku - this does not seem to work.. Am i missing anything here..