@unionjack Same here, after 2 days it looks to be working again with the latest version 60.0.3255.59 installed on my Mac. Thanks Forum 
Latest posts made by lancer2009
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Opera for computersRE: Updated Opera and VPN still doesn't work
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Opera for MacRE: No Internet when VPN is On
I'm having the same problem for the last 2 days. Even tried a restart and no change.
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Opera for WindowsRE: Opera 50.0 flat-out refuses to save handler for magnet: links
I'm having the same issue on my Mac.
A few days ago I Cleared some of the browser data and even since then the Magnet Links from TPB do exactly what you said, every single time.
Also tried installing a fresh copy on a different Mac which has never have Opera, some message and no way to change it.