Consider the following scenario:
You try to log on a wireless network by using a new single sign-on (SSO) account on a computer that is running Windows RT 8.1 or Windows 8.1.
This is the first time that you use the new SSO account on the computer.
You enter an incorrect credential for the new SSO account, and the logon fails.
You enter a correct credential to log on again.
In this scenario, you encounter one of the following issues:
You stay on the Welcome screen with spinning dots for several minutes, and then go back to the logon screen together with error messages.
You restart the computer, and try to log on again. Then you stay on a black screen.
The issue occurs because the user profile service crashes if it tries to read an empty profile during the logon sequence.
To resolve this issue, install update 2919355. 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:
2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014
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