Bother. Something I hadn't tested was the quick edit feature, and it looks like that is throwing up an error now. The old error is gone but attempting to use the quick edit now generates this:
Hacking attempt...
SELECT IFNULL(mem.realName, m.posterName) AS posterName, m.posterTime, m.body, m.ID_TOPIC, m.subject, t.locked
FROM (smf_messages AS m, smf_boards AS b, smf_topics AS t)
LEFT JOIN smf_members AS mem ON (mem.ID_MEMBER = m.ID_MEMBER)
WHERE m.ID_MSG = 59527
AND b.ID_BOARD = m.ID_BOARD
AND t.ID_TOPIC = m.ID_TOPIC
AND 1 ';
LIMIT 1
File: /home/cofexm/public_html/Sources/Post.php
Line: 2052