"There's a configuration problem preventing us from getting your document. If possible, try opening this document in Microsoft Word." Office WebApp Error

Problem:
When Opening a word document I get the following error when Office Web Apps tries to render the document "There's a configuration problem preventing us from getting your document. If possible, try opening this document in Microsoft Word."

Initial Hypothesis:
Check the ULS logs on the Web Front End (SharePoint Server) as this doesn't tell me much.  I found the following issue in my ULS:

WOPI (CheckFile) - Invalid Proof Signature for file SandPit Environment Setup.docx url: http://web-sp2013-uat.demo.dev/Docs/_vti_bin/wopi.ashx/files/6d0f38c0d5554c87a655558da9cedcad?access_token...


Resolution:
Run the following PS> Update-SPWOPIProofKey -ServerName "wca-uat.demo.dev"

More Info:
http://technet.microsoft.com/en-us/library/jj219460.aspx

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