I have a very peculiar issue using Azure Table Storage. I have a .NET 4.5 project in Visual Studio 2012 where I deal with all my Azure Table Storage functions. This project/
I had a similar problem as well, but I wasn't using Azure and there was no hard-coded reference that was pointing to 5.2. But it resolved (after finding this article) by making sure that the text in the .svc pointed to the correct assembly:
<%@ ServiceHost Language="C#"
Factory="System.Data.Services.DataServiceHostFactory,
Microsoft.Data.Services, Version=5.6.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Service="MVC4WCFDataServiceFE5.NorthWindService" %>
Note the Version=5.6.0.0, which I didn't have before.