Two issues with the latest Dev Build and WhatsApp.
1 If I close Opera and open it again, I always have to load the WhatsApp sidebar app to make it work again. I'm not getting any messages otherwise.
2 The notifications setting doesn't stay. It always prompts me to enable notifications and when I do I see a pop-up open with some kind of confirmation but it closes right away so I can not do anything. After a while WhatsApp says I should enable notifications again.