AutoCAD 2010 freeze on start-up

Just posting in case someone else Googles this problem.  I have a user on AutoCAD 2010 who complained that it would not start up, and instead would freeze with a grey interior window space.  I started playing with the registry, and changed HKEY_CURRENT_USER\Software\Autodesk\MC3\MC3OptIn DWORD value to 0, and the application now starts fine.

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