Please provide your Plugin environment as requested in the posting guidelines. It does not appear as though you have the Power add-on installed on the dev site but it is installed on the first site. The Power add-on is required for categories. Check in your admin panel to see if you have the current version of Power installed and activated.
Hello? Are you all set? please post in Premier so I can keep track of these and provide you with our full attention. The one site you are using the Plugin and it shows Premier being used along with Experience and Power.
Thanks, if I do not hear back I will close this post.