Since yesterday (October 2nd, 2014), there seem to be random errors when trying to access apps that use OAuth 2.
There are two problems:
We can\'t a
I caused the same problem at OpenID Connect authentication, so I had been made a query to Google Cloud Platform support.
Google updated to be not able to short name scope on Marketplace (without an announcement). Now Google are considering to re-use short name scopes. So We have to use long URL scope until Google corresponding to complete.