Coding problem: this page does not set $PAGE->context properly.

line 341 of /lib/pagelib.php: call to debugging()
line 599 of /lib/pagelib.php: call to moodle_page->magic_get_context()
line 1236 of /lib/weblib.php: call to moodle_page->__get()
line 3581 of /lib/accesslib.php: call to format_string()
line 52 of /filter/manage.php: call to print_context_name()