I'm facing the exact same issue when I enable dark Mode on Windows 10.

Any fix ..any one can plz suggest?

I'm on Opera beta Version:62.0.3331.16 and I'm facing the same issue. I was able to connect on the earlier version of Opera beta. Don't recall which version but I feel the problem is something with the Windows Firewall which is not letting Opera look for any Chromecast device on the same network. And hence, It gives the message: No Device Found.

Anyone, please help..

I'm facing the exact same issue when I enable dark Mode on Windows 10.

Any fix ..any one can plz suggest?

@hard666 Many Thanks. Solved my problem..