At opera:plugins (type this and press Enter in the address field), is the PPAPI one enabled and the NPAPI disabled?
Click the "Show details" button and try setting it like that and restart Opera.
This is what I see
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Hello, I'm a new Opera user that is trying to adjust to the new browser. One problem that I've noticed is that all Flash content displays in Low-Resolution. I've updated to the latest Opera build and Flash Player build and the Flash player is still in low resolution. I've also searched around the forums and I wasn't able to find an answer! And to confirm, the Flash player in Chrome & Safari do not have this low-resolution problem. Only Opera. Please help. Thanks.
15" Retina MacBook Pro - Opera 24.0.1558.53 - Adobe Flash 188.8.131.52