Also experiencing the same issue with, as the OP said, an Adobe AIR application. During the auth process the user is redirected to https://twitter.com/intent/sessions - unfortunately, the HTML Window is unable to follow the redirects, which leaves the user stuck on a white screen. The issue appears to be unexpected with no explanations or notice. Other than using the web browser, is there another way around this?
Doesn’t seem to work for StageWebView, what version of AIR are you using?