Try the following:
Apple (Safari and other browsers) seems to block Flash.
This page has information for (re)enabling Flash:
https://helpx.adobe.com/flash-player/kb/enabling-flash-player-safari.html
For other systems, please ensure you have downloads enabled, so that a version should be able to be downloaded into an Echoplayer.
You may also use a standalone Flash Player to open the echo_desktop.swf file with full Echoplayer functionality: http://labs.adobe.com/downloads/flashplayer.html
If the problem continues to persist, please contact our Technical team at moodle@ac.edu.au.
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