Whenever you stop the server, server losses all its state for example users, dynamic rooms, etc. So, I if you will try to recover connection after server has restarted, it will give AUTH Error as the server does not have that user to recover.
SetPollingMode was available in old version of SDK. The new version does not have it. Thanks for this information, we will remove it from documentation.
Regarding hanging of application, we will try to debug the SDK and check out if there is any such bug and what is the cause.
You can download the Marmalade SpaceWarFare sample from here https://www.dropbox.com/s/gll8j22veodo0yp/Marmalade_SpaceWarFare.zip?dl=0