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Description
The specific code is in this revision: http://moodle.cvs.sourceforge.net/moodle/moodle/blocks/moodleblock.class.php?r1=1.88&r2=1.89
get_context_instance(); doesn't work for sticky blocks (MDL-10977).
The result is that sticky blocks won't show and you'll get an error message like 'Error: could not insert new context level "80", instance "1".'