sorry, i'm not familiar with the way your screen works/looks as i have certain things used for moderation. does your screen have blue rectangles Tools at the bottom? if so, is there a number in parentheses after you have used the check box? if so, click on the blue rectangle to 'process' the checked boxes.
also, i don't subscribe to threads, and i choose not to receive email notifications, so i'm not sure how to help you from here.