It's not the wifi that would be the issue. The Opera browser is a bit different in that everything viewed with it is cache or passed through the Opera server. When you view a site on Opera, you are actually viewing it by way of their server. His is done to optimize performance and unify display characteristics and more.
This would prohibit direct connecting to the Pi setup page as its not "on the Internet server". I believe this is why it is timing out because it's looking to the Opera server and finding nothing.
Opera was chosen due to its performance and display ability on "mini" devices with less bandwidth. We've looked for other browsers that perform, yet are not "server based", however they very limited and have been cost prohibitive. We will continue to watch for new browser options that are compatible on iFly devices.