Can't open word, pdf, pptx or excel documents using Office Web Apps.

Problem:
Can't open word, pdf, pptx or excel documents using Office Web Apps.  ULS on the OWA servers included these log messages:

WOPI (CheckFile) - Invalid Proof Signature for file.  WOPI Proof: All WOPI Signature verification attempts failed.  WOPI Signature verification attempt failed with public key.

Also found in the logs: "Error message from host: Verifying signature failed, host correlation" "
HttpRequestAsync (WOPICheckFile,WACSERVER), request failure [HttpResponseCode:NotFound, HttpResponseCodeDescription:Not Found, url:https://www.demo.dev/_vti_bin/wopi.ashx/files/8b07d55558955551beb5555bed545553?access_token=REDACTED_1014&access_token_ttl=1392256555993]"

Same issue ULS excerpt:
Error message from host: Verifying signature failed, host correlation:
WOPI CheckFile: Catch-All Failure [exception:Microsoft.Office.Web.Common.EnvironmentAdapters.FileUnknownException: WOPI 404  
 at Microsoft.Office.Web.Apps.Common.WopiDocument.LogAndThrowWireException(HttpRequestAsyncResult result, HttpRequestAsyncException delayedException)

FileUnknownException while loading the app.

 
Hypothesis:
None, I can't understand why the SP and WCA farm are struggling to communicate.  I believe the cause is to do with the the load balancing/network changing [sic - maybe].

Resolution:

Remove the link between the Sp farm and WCA

PS> Remove-SPWOPIBinding –All:$true

Connect SP to the WOPI farm

PS> $internalName = "wca.demo.dev"
PS> $internalZone = "internal-https"
PS> New-SPWOPIBinding -ServerName $internalName –AllowHTTP
PS> Set-SPWopiZone -zone $internalZone

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