I think something in CDN tools is messing with the WP 3.1 widgets screen. When CDN tools is active, I can't drag-and-drop any of the widgets. I deactivated all other plugins; this is definitely the one with the issue. I'm also running Thesis 1.8 if that makes any difference.
Any help would be most appreciated! I'd really like to use this plugin to connect with my CDN. Thanks!