That works fine on OS X (Safari and Firefox) and on Windows with Firefox. However, it hangs with Internet Explorer.
It hangs waiting for data from this:
(where the ellipsis is the token)
That is not the authentication URL that my code launches. That seems to be some translation of it.
Since it works otherwise I suspect the page generated by Evernote for IE has a bug or IE has some weird behavior and I need to set some registry entries.
I welcome advice.
(I think I have seen another failure on IE only just before the callback, but if that is still there, it is blocked by this. Maybe I saved a password or something to create the block.)