The current code does not reference the "guests" table used by the shoutbook module to use Drupal's table prefix. All SQL queries should be changed to replace "guests" with "{guests}" to fix the problem. This will allow Drupal to append the table prefix specified in the site config file.
Comments
Comment #1
deekayen commentedI added the brackets in a commit with some Drupal 4.7 updates.
Comment #2
(not verified) commented