Getting the following error with the same accounts described in my
other email with subject "fopen error" (account with many emails in
the in box):

DB Error in /Library/Apache2/htdocs/roundcubemail/program/include/ rcube_db.inc (148): DB Error: unknown error; QUERY: INSERT INTO cache (created, user_id, session_id, cache_key, data) VALUES (now(), ?, ?, ?, ?)

Regards, Stephen