from the moodle.org apache error_log:

Coding problem: this page does not set $PAGE->context properly.<ul style="text-align: left"><li>line 337 of /lib/pagelib.php: call to debugging()</li><li>line 595 of /lib/pagelib.php: call to moodle_page->magic_get_context()</li><li>line 1216 of /lib/weblib.php: call to moodle_page->__get()</li><li>line 879 of /lib/pagelib.php: call to format_string()</li><li>line 49 of /error/index.php: call to moodle_page->set_title()</li></ul> in /var/www/vhosts/moodle.org/html/lib/weblib.php on line 3005, referer: http://moodle.org/login/index.php

occurs multiple times