Yep, same thing here. I can log in and I even have my old "Please verify" email that Opera sent me. If I click the link in that email, it says, "Your email is already verified." But if I go to the developer panel and try to see my add-on, it says my email is not verified, and I can't proceed.
Sad to see Opera in such a sorry state. I guess add-ons for Opera aren't really a priority. I mean, I kind of knew this when it took two months to get a review ("Rejected because your email is not verified."), but this is just egregious.
Here are some screenshots and things, if anybody is curious: https://twitter.com/mlissner/status/951507730497339393