PDO exception when creating new content with entityreference fields

After installing Domain Access on an existing D7 development site, I'm getting this exception when trying to create a new item of a specific content type:

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'nid' in where clause is ambiguous: SELECT DISTINCT node.nid AS entity_id, node.vid AS revision_id, node.type AS bundle, :entity_type AS entity_type FROM {node} node INNER JOIN {node_access} na ON na.nid = node.nid WHERE (nid IN (:db_condition_placeholder_0)) AND (type IN (:db_condition_placeholder_1)) AND(( (na.gid = :db_condition_placeholder_2) AND (na.realm = :db_condition_placeholder_3) )OR( (na.gid = :db_condition_placeholder_4) AND (na.realm = :db_condition_placeholder_5) )OR( (na.gid = :db_condition_placeholder_6) AND (na.realm = :db_condition_placeholder_7) ))AND (na.grant_view >= :db_condition_placeholder_8) ORDER BY node.title ASC; Array ( [:db_condition_placeholder_0] => 20 [:db_condition_placeholder_1] => tour [:db_condition_placeholder_2] => 0 [:db_condition_placeholder_3] => all [:db_condition_placeholder_4] => 0 [:db_condition_placeholder_5] => domain_site [:db_condition_placeholder_6] => 2 [:db_condition_placeholder_7] => domain_id [:db_condition_placeholder_8] => 1 [:entity_type] => node ) in EntityFieldQuery->execute() (line 1136 of /Volumes/Opus Locus/Sites/_drupal7/core/includes/entity.inc).

As far as I can tell there is nothing special about my config. MAMP 1.9, PHP 5.2.13, no PHP optimizer or caching. Drupal caches flushed, user permissions rebuilt...

One thought is that the content type includes two entity reference fields - other content types have none.