Thats very interesting to know. One thing I thought was odd was that the second I went to port 80, not only did it all work perfectly but the plugin switched to the flash plugin. Any idea why that was ?
[Rather than clutter the original thread on "PoodLL and Moodle Proxy" I moved this conversation to a new thread: Justin]
The HTML5 recorders only work on HTTPS, its something they decided over at Google/Mozilla I think. The default port for https is 443, and http is port 80. I am guessing thats why you got the HTML5 recorder on 443 and Flash recorder on 80.
But you are right that it is interesting. It is worth me testing that a little.