Subscribing to mailing list unchecks box

I wanted to subscribe to the security newsletter, so I went to http://drupal.org/user/UID/edit/newsletter and clicked the box for 'Security Announcements', and clicked Save. Upon submit, I was shown a success message that I was subsribed to the security announcements list, however, the box next to 'Security Announcements' had been unchecked (and remains unchecked on subsequent loads of the page).

Screenshot attached.