MDL-42020 I noticed few warnings. I think it was when I was purging cache but I can't reproduce.
[Fri Oct 11 11:25:05 2013] [error] [client 127.0.0.1] Debugging: Coding problem: $PAGE->context was not set. You may have forgotten to call require_login() or $PAGE->set_context(). The page may not display correctly as a result<ul style="text-align: left" data-rel="backtrace"><li>line 451 of /lib/pagelib.php: call to debugging()</li><li>line 1465 of /lib/pagelib.php: call to moodle_page->magic_get_context()</li><li>line 1538 of /lib/setuplib.php: call to moodle_page->initialise_theme_and_output()</li><li>line 42 of /course/ajax/management.php: call to bootstrap_renderer->__call()</li><li>line 42 of /course/ajax/management.php: call to bootstrap_renderer->header()</li></ul>, referer: http://jerome.moodle.local/m/integration_master/course/management.php?categoryid=2
Just writing this issue in case you want to have a look around course management the code.