suppressing category avatar display

I do not want category avatars to display. I have downloaded the category plugin and want to use it, but I cannot figure out how to turn off category avatar displays. I have set all switches to "No" on the Settings>Layout>Avatars screen (attachment) and refreshed my browser but they still show up (attachment). Is this setting controlled in another place? If so, where? If not, what might be going on. This is on a local development (prototyping) machine, so I have login information for you. I'm hoping you can tell me where to look for a problem.