I'm basically stumped then. All I can suggest trying it taking this query:
And adjusting the red part up specific increments until it doesn't happen (assuming it will stop).
Code:
SELECT MIN(post.postid) AS minpost, MAX(post.postid) AS maxpost, thread.threadid, MAX(post.dateline) AS dateline,
(COUNT(*)-1) AS posts,
SUM(attachment.visible) AS attachsum
FROM post,thread
LEFT JOIN attachment ON attachment.attachmentid=post.attachmentid
WHERE thread.threadid=post.threadid
AND thread.threadid>=400
AND thread.threadid<2000
GROUP BY thread.threadid
ORDER BY threadid DESC;
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