After commenting out

//redirect("$CFG->wwwroot/$CFG->admin/");

from index.php, a logged in non-admin users sees

Notice: Undefined property: stdClass::$summary in /var/www/dev/course/lib.php on line 1872

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 10

SELECT c.id,c.category,c.sortorder,c.shortname,c.fullname,c.idnumber,c.teacher,c.teachers,c.student,c.students,c.guest,c.startdate,c.visible,c.newsitems,c.cost,c.enrol,c.groupmode,c.groupmodeforce, ctx.id AS ctxid, ctx.path AS ctxpath, ctx.depth as ctxdepth, cc.path AS categorypath FROM mdl_course c JOIN mdl_course_categories cc ON c.category=cc.id JOIN mdl_context ctx ON (c.id=ctx.instanceid AND ctx.contextlevel=50) WHERE c.id IN (2) ORDER BY

• line 677 of lib/dmllib.php: call to debugging()
• line 905 of lib/datalib.php: call to get_recordset_sql()
• line 1425 of calendar/lib.php: call to get_my_courses()
• line 1206 of calendar/lib.php: call to calendar_get_default_courses()
• line 24 of blocks/calendar_month/block_calendar_month.php: call to calendar_session_vars()
• line 210 of blocks/moodleblock.class.php: call to block_calendar_month->get_content()
• line 234 of blocks/moodleblock.class.php: call to block_base->is_empty()
• line 338 of lib/blocklib.php: call to block_base->_print_block()
• line 269 of index.php: call to blocks_print_group()

Fatal error: Call to a member function RecordCount() on a non-object in /var/www/dev/lib/datalib.php on line 908