Thread:Adjoint/@comment-22439-20160224145529/@comment-26339491-20160304165604

I've given it a try, and was able to add the category without a problem. If you're sure you've pressed Enter after typing in the category, and the "Save" button still doesn't activate, the problem probably lies with your local browser settings.

You could try using a different browser, or delete cache and cookies, update, and restart your current browser. That often solves the issue. If it still doesn't, please send a bug report through Special:Contact!