@dexotaku same here with QBittorent. Moreover — no other handlers can be saved. As example — Nexus links for Nexus Mod Manager will always show this dialog.
Clean Windows 10 installation with clean Opera 50.
Best posts made by haired
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	RE: Opera 50.0 flat-out refuses to save handler for magnet: linksOpera for Windows
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	RE: [Solved]Restoring number of columns in SD (New R3)Opera for Windows@bbildman opera://settings/startPage → Automatically adjust the maximum number of columns OFF → 7 
- Opera for Windows