Update: I think I have found out why nanogong will fail to playback a recording in some courses. If the filters for the course has been set with HTML tidy turned 'on' then nanogong won't playback a recording. So if you also encounter this problem, try this troubleshooting idea: go to Course Administration --> settings --> Filters & make sure your html tidy is set to off.
Release of NanoGong with Moodle 2 Support - version 4.2.3
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