This plugin hasnt been tested with the latest three major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
I just gave this one a test after responding to someone else having issue with another similar plugin. I might actually make use of this one myself as the one I was using (Display Categories Widget) is all messed up with our new theme.
if they could add a radio button to select either include or exclude it would be even better. I use categories to archive stuff that i don't want to show on the main page so including just my main categories is easier than having to add the new archive cat to the exclude list.
Installed a week ago and the plugin hides a single category as expected. However, I just added a second category to hide, but it is not working. Hopefully an easy fix -- I've submitted a support ticket. Great plugin -- just need to get it to work properly.