We've added the possibility to obtain non expiring access tokens. This takes the burden of having to refresh the tokens away, which caused quite some headaches for developers of certain apps (locking the tokens while refreshing, uploading with an almost expired token etc.).
To obtain the non expiring access token all you have to do is to send the
scope=non-expiring parameter when directing the users to the connect screen:
Find more about the details in our Authentication Docs.