After doing a plain old install of 4.1.0 (from the rel-410 branch at SF) and logging in, I get this:
ERROR: query failed: SELECT count(dr.dr_id) c FROM `dated_reminders` dr JOIN `users` u ON dr.dr_from_ID = u.id JOIN `dated_reminders_link` drl ON dr.dr_id = drl.dr_id WHERE drl.to_id = ? AND dr.`message_processed` = 0 AND dr.`dr_message_due_date` < ADDDATE(NOW(), INTERVAL 5 DAY)
Error: Table 'openemr410.dated_reminders' doesn't exist
Seems the missing SQL setup is in sql/patch.sql you're supposed to do an upgrade from admin.php to run it. That should not be necessary. The SQL should be in database.sql.