Because of the recent security issue, we were forced to modify check_output()'s API. check_output() now takes a third paramter $check. If check = TRUE, check_output() checks whether the current user is allowed to use the specified input format. Note that this will check the permissions of the current user, so you should specify $check = FALSE when viewing other people's content. When showing content that is not (yet) stored in the database (eg. upon preview), set to TRUE so the user's permissions are checked. In DRUPAL-4-6, $check defaults to FALSE. However, in HEAD, $check defaults to TRUE for extra safety. This means you'll have to check your code in DRUPAL-4-6 to see if you don't need to insert a TRUE, and that you'll have to check your code in HEAD, as most of them will need an explicit FALSE. -- Dries Buytaert :: http://www.buytaert.net/