Cannot move album: "Fatal error: Only variables can be passed by reference"

The problem is the call to taxonomy_save_term( (array)$album ); in function _image_pub_gr_move_album().

This appears to be related to a PHP bug (http://bugs.php.net/bug.php?id=33643) also reported at http://drupal.org/node/14253

Fixed in CVS:
taxonomy_save_term( (array)$album );
becomes

$term = (array)$album;
taxonomy_save_term( $term );