Hi Gordon,
I thought bracket notation will deserve a separate thread ...
I tried it on the test server and got this:
Fatal error: Cannot access protected property mod_hotpot_attempt_hp_6_jcloze_xml_renderer::$headcontent in C:\Inetpub\Moodle\20\mod\hotpot\mediafilter\class.php on line 151
Seems an issue with the access to mediafilters ...
Cheers
Stan