The D6 version of MLM deprecates its old-school dependence on using a node type for mailing lists, but makes this functionality _optional_. The mlm_list() function in mlm.module does a LEFT JOIN on the node table so that it can access the node title, if the list is attached to a node. If the list's nid is 0 or null, then the relationship would not exist.

Well and good. Until node_access enters the mix. Because db_rewrite_sql() creates an INNER JOIN to the node_access table, any list that is not a node will be excluded from the results. The workaround is to comment out line 386 of mlm.module, or:

  //$sql[0] = db_rewrite_sql($sql[0] . tablesort_sql($sort));

The solution is ...?