Why is a gray tile workstation in Server 2012 RWW still connecting properly?

nphdadmin used Ask the Experts™
I have a Windows Server 2012R2 running RWA (previously called RWW) with a gray tile that connects properly using RDP to the workstation, just like the blue tiled workstations.  Thoughts as to why it still works even though it's gray colored?
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I resolved this myself by removing the computer from AD and the domain.  I then re-attached it by using the Windows Server Essentials connect tool.

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