Filter links broken after upgrade to Gallery2.3 (svn)

After upgrading Gallery to 2.3 (currently 2.3-svn core 1.2.31 r17563) in preparation for upgrading to Drupal 6.1, all images embedded in posts with the Gallery2 syntax are broken. Instead, [G2:18168] is displayed where the image was prior to upgrading. One page does display correctly, but no images on the front page of the main blog are displayed. The Grid Block does display properly. Perhaps, they will work after I upgrade from Drupal 5.7 to 6.1?