Hello, For some reason, the navigation block has vanished from my website. But when you login (with any account) the block appears again. This just happened today, and I haven't touched Drupal in the last 3 days, so it is not obviously something I did. In addition, all other blocks look just fine. It is only the navigation block that is acting up. Is there a setting somewhere that might make a block appear only for authenticated users? I have Drupal 4.7 btw. Earlier today I also got a note from a user about what looks like a MySQL-related error. I don't know if this is at all related, but I include it below just in case. --------- * user warning: Got error 28 from storage engine query: SELECT DISTINCT(p.perm) FROM role r INNER JOIN permission p ON p.rid = r.rid WHERE r.rid IN (1) in /home/theingot/public_html/community/includes/database.mysqli.inc on line 124. * user warning: Got error 28 from storage engine query: SELECT t.* FROM term_node r INNER JOIN term_data t ON r.tid = t.tid INNER JOIN vocabulary v ON t.vid = v.vid WHERE (t.tid IN ('3','4','9','10','11','12','13')) AND r.nid = 1 ORDER BY v.weight, t.weight, t.name in /home/theingot/public_html/community/includes/database.mysqli.inc on line 124 --------- Line 124 is inside function _db_query() and the relevant lines are: if (!mysqli_errno($active_db)) { return $result; } else { trigger_error(check_plain(mysqli_error($active_db) ."\nquery: ". $query), E_USER_WARNING); return FALSE; } So I guess all we know is that there was some MySQL error. I don't see how this could be connected to the navigation block disappearing, but I thought I'd include it for completeness. I would be grateful for any assistance you may offer. Daniel.