404's on custom post types can sometimes be caused by permalinks not being updated after you've moved a site (and sometimes for other reasons). In your WordPress backend, go to Settings -> Permalinks and resave them, then go back to your custom post type and add a new post under it. Click the 'View' button once you've done this to make sure your getting taken to the correct url for that post type and see if that works.
If you're still having issues it might be a symptom of something else causing issues. Do a new fresh install of WordPress somewhere else, install Kontrol, create a custom post type and see how it goes then.
Hope that helps mate,