[Johnny Doomo]

I've narrowed down the problem... If the admin usergroup doesn't have permission to upload images to a category, it doesn't show that cat available in the dropdown menu on the bulk action page in the adminCP.

Whether this is a bug or not, I'm not sure how you guys consider it. To me they seem like to seperate things and just because I allow somebody to upload (or not) doesn't mean the cat should be hidden from that person unless I set the permission that says "These checked usergroups can view images in this category." But I guess it's up to you how you want to deal with it. For the time being I just set the admin to upload to the unregistered category and the option appeared in the dropdown box. So I can now bulk remove any unwanted uploaded images by unregistered users.