Prefix for Forum Status Images for Category

[skor]

I have used the Prefix for Forum Status Images to assign status icons for each of my forums. The problem I am having is that on the forum homepage I also have Categories with subforums.

When I try to use the Prefix for Forum Status Images on the Categories, the status icons for the categories do not change. I have created new category_forum_new.png images with the appropriate prefix (eg. 1_category_forum_new.png and 1_category_forum_old.png) but they do not show up. Instead the default images are still showing up.

Does the Prefix for Forum Status Images only work if it's a forum and not categories?

Thanks for your help!