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   Scenario and Symptom:  An Office Web Apps 2013 server is talking to a SharePoint 2013 server and the following shows up in the ULS log (C:\ProgramData\Microsoft\OfficeWebApps\Data\Logs\ULS) of the OWA/WAC server:  03/14/2014 10:19:20.90         w3wp.exe (0x1CDC)    0x2854 Office Web Apps         Office Web Apps common            agq6x  Exception        WAC Server FrontEnd unhandled exception [0] System.ArgumentException: An item with the same key has already been added.     at System.Col…
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