exception on "What's going on" view with private groups

This appears to be coming from commons_follow_group_commons_follow_get_nids().

  $gids = og_get_entity_groups('user', $account);
  if (empty($gids['node'])) {
    return;
  }

Not necessarily related, but it would appear that if a user hasn't contributed to any groups, that she'd be unable to follow them. Worth verifying while we're working in this function.

http://drupalcode.org/project/commons_follow.git/commit/a0e3f52

We had EFQ queries against the flag_content table that tagged for node access.

The tag is out of place and unnecessary here as the finally IN() query assembled by commons_follow.module enforces node access:
SELECT node.changed AS node_changed, field_data_field_radioactivity.field_radioactivity_radioactivity_energy AS field_data_field_radioactivity_field_radioactivity_radioacti, node.nid AS nid FROM node node LEFT JOIN field_data_field_radioactivity field_data_field_radioactivity ON node.nid = field_data_field_radioactivity.entity_id AND (field_data_field_radioactivity.entity_type = :views_join_condition_0 AND field_data_field_radioactivity.deleted = :views_join_condition_1) WHERE (( (node.nid IN(:node_nid_0, :node_nid_1, :node_nid_2, :node_nid_3, :node_nid_4, :node_nid_5, :node_nid_6, :node_nid_7, :node_nid_8, :node_nid_9, :node_nid_10, :node_nid_11, :node_nid_12, :node_nid_13, :node_nid_14, :node_nid_15, :node_nid_16, :node_nid_17, :node_nid_18, :node_nid_19, :node_nid_20, :node_nid_21, :node_nid_22, :node_nid_23, :node_nid_24, :node_nid_25, :node_nid_26, :node_nid_27, :node_nid_28, :node_nid_29, :node_nid_30, :node_nid_31, :node_nid_32, :node_nid_33, :node_nid_34, :node_nid_35, 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:node_nid_503, :node_nid_504, :node_nid_505, :node_nid_506) ) )AND(( (node.status = :db_condition_placeholder_2) )))AND ( EXISTS (SELECT na.nid AS nid FROM node_access na WHERE (( (na.gid = :db_condition_placeholder_3) AND (na.realm = :db_condition_placeholder_4) )OR( (na.gid = :db_condition_placeholder_5) AND (na.realm = :db_condition_placeholder_6) ))AND (na.grant_view >= :db_condition_placeholder_7) AND (node.nid = na.nid) )) ORDER BY node_changed DESC LIMIT 4 OFFSET 0