Please take a look at the screenshot!
Similar errors occur - when logged in as course creator - on the front page!
There seems to be no loss of function...besides the error message...

ORA-00904: Ungültiger Spaltenname (invalid column name)

SELECT c.* FROM m_role_assignments ra INNER JOIN m_context x ON x.id=ra.contextid INNER JOIN m_course c ON x.instanceid=c.id AND x.contextlevel=50 WHERE ra.userid=2 UNION SELECT c.* FROM m_role_assignments ra INNER JOIN m_context x ON x.id=ra.contextid INNER JOIN m_course_categories a ON x.instanceid=a.id AND x.contextlevel=40 INNER JOIN m_course c ON c.category=a.id WHERE ra.userid=2 UNION SELECT c.* FROM m_role_capabilities ca INNER JOIN m_context x ON x.id=ca.contextid AND x.contextlevel=50 INNER JOIN m_course c ON c.id=x.instanceid WHERE ca.contextid 1 AND ca.capability='moodle/course:view' ORDER BY visible DESC,sortorder ASC

• line 677 of lib/dmllib.php: call to debugging()
• line 746 of lib/datalib.php: call to get_recordset_sql()
• line 302 of user/view.php: call to get_my_courses()