Consider the following scenario:
You use third-party credential authentication to log on to a Windows RT, Windows 8, or Windows Server 2012-based computer.
After the third-party authentication succeeds, the computer displays the Windows logon window.
You cancel the Windows logon window by clicking the back arrow.
In this scenario, the third-party authentication dialog cannot be displayed again.
This issue occurs because the ICredentialProviderCredentialEvents::OnCreatingWindow method returns an E_FAIL (0x80004005) error, and the parent handle value is NULL.
To resolve this issue, install update rollup 2975331. For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2975331 August 2014 update rollup for Windows RT, Windows 8, and Windows Server 2012
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates