It doesn't happen to every member. My account doesn't seem to have the issue. A test account doesn't either. Others seem to be having it. From the ACP error log:
Type of error: General
Please try again. If you come back to this error screen, report the error to an administrator.
/index.php?action=unreadreplies
File: /public_html/sources/database/Db-mysql.class.php
Line: 679
----------------------------------------------------------------------------------------------
Type of error: Database
Database Error: Unknown column 'lt.unwatched' in 'where clause'
SELECT t.id_topic
FROM elk_topics_posted_in AS t
LEFT JOIN elk_log_topics_posted_in AS lt ON (lt.id_topic = t.id_topic)
WHERE t.id_board IN (1, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 37)
AND COALESCE(lt.id_msg, t.id_msg) < t.id_last_msg AND COALESCE(lt.unwatched, 0) != 1
ORDER BY t.id_last_msg DESC
LIMIT 0, 20
/index.php?action=unreadreplies
/public_html/sources/subs/Unread.class.php
Line: 402