Integrity constraint violation: 1062 Duplicate entry '7-4397' for key 1: line 115 of /modules/acl/acl.module

Here's what I know so far - bad upgrade from 6.2 to 7.0, in particular with forum. Forum, ACL, Forum Access "seem" fine (maybe) when advanced forum is off. Turning on advanced forum now makes the forum disappear. But, the error I get is related ACL, so starting here.

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '7-4397' for key 1: INSERT INTO {acl_node} (nid, acl_id, grant_view, grant_update, grant_delete, priority) SELECT n.nid AS nid, 7 AS acl_id, 1 AS grant_view, 1 AS grant_update, 1 AS grant_delete, 0 AS priority FROM {taxonomy_index} n WHERE (n.tid = :db_condition_placeholder_1) ; Array ( [:db_condition_placeholder_1] => 10693 ) in acl_add_nodes() (line 115 of /home/hoslot5/public_html/sites/all/modules/acl/acl.module).