Thanks for the comment but Proprietary media types is only supported by Windows for this release.

I'm on a Mac with 10.9.4 and use Opera 23.0.1522.77. My flash is up to date. I haven't installed plugins. Still I can't view the video's on that site for example:
https://www.creativelive.com/courses/art-business-high-end-retouching-pratik-naik
Is this a bug or what? Maybe I have to do something to resolve the problem. BTW I like this browser.