Download the attached test.php Place it in your dirroot Ensure that your Moodle has debugging enabled and display debug messages Call the script in a browser http//yourmoodle.xxx/test.php You should see debugging information Coding problem: unsupported modification of PAGE->context from 30 to 10 line 934 of /lib/pagelib.php: call to debugging() line 13 of /test.php: call to moodle_page->set_context() Copy the file and call the script in a 2.7 or 2.8 installation, you should not see any debugging information