I added the following to
MDL-16916:
This continues to be an issue in 1.9.3+ (Build: 20090106). With debugging set at MINIMAL, a blank page appears, but when set to ALL the following message appears:
Warning: require_once(HTML/AJAX/JSON.php) [function.require-once]: failed to open stream: No such file or directory in /var/www/moodle/group/index.php on line 14
Fatal error: require_once() [function.require]: Failed opening required 'HTML/AJAX/JSON.php' (include_path='/var/www/moodle/lib/
pear:/var/www/moodle/lib/pear:.:/usr/share/php:/usr/share/pear') in /var/www/moodle/group/index.php on line 14
This server has never had anything other version than 1.9 on it.