Just a small nitpick I guess, but the link and text in the following image seem confusing. 
From that text it makes me feel like clicking “Why not create a topic” will create a topic in the current category, however as I don’t have suitable permissions to, it sets the category to ‘uncategorized’
This seems very unintuitive to me, maybe get rid of that link (and the ‘New Topic’ button) if you cannot actually create a topic in that category?