On the course > import page we run into a problem if the user has course:update capability on more than 1000 courses.
In moodle/course/import/activities/mod.php there is a call to get_records_list:

$taught_courses = array();
if (!empty($tcourseids))

{ $tcourseids = substr($tcourseids,0,-1); $taught_courses = get_records_list('course', 'id', $tcourseids, 'sortorder'); }

If $tcourseids has more than 100 items then we get Oracle error
ORA-01795: maximum number of expressions in a list is 1000