You can enable taxonomy access control and nothing will go haywire. However be sure to set every existing category and the defaults to what you want -- generally, allowing all roles to view (or anonymous and authenticated, and non-authenticated if applicable, as other roles will inherit from these)
Otherwise, once you save the settings for that role, watch out. Goodbye site content! All posts (nodes) in those categories can disappear.
You can enable taxonomy access control and nothing will go haywire. However be sure to set every existing category and the defaults to what you want -- generally, allowing all roles to view (or anonymous and authenticated, and non-authenticated if applicable, as other roles will inherit from these)
Otherwise, once you save the settings for that role, watch out. Goodbye site content! All posts (nodes) in those categories can disappear.
The solution of course is just to define everything correctly for anonymous and authenticated users especially and save again for each of those.