EDIT i wrote the email below and have just found the fix - i was blocking third party cookies for privacy reasons. After whitelisting the site it worked properly.
If possible it would be useful to provide some feedback to the user in this case.
When i follow the link to use the new Axure Share area (now renamed Axure Cloud), and try to log in with my Axure Share credentials it fails to authenticate.
The button turns from green to grey when i click it, signifying that it has registered the input, but then nothing else happens.
Previously this feature was accessible, but for the last two weeks it has not worked.