I am deploying an Umbraco 13 site using the Igloo theme to a basic IIS server that has numerous Umbraco sites and have run into an issue I have not seen before. Everything works great in development, but in production I can access the back end and can see all of the content there but when I try to load a published page it is blank. It must have something to do with assembling the page from the various widgets because a page with no widgets will load. the header, nav and footer.
The first error I receive is: Unexpected exception in ""IISHttpContext"."WriteBody"". System.InvalidOperationException: Concurrent reads or writes are not supported. at System.IO.Pipelines.Pipe.GetReadResult(ReadResult& result) at System.IO.Pipelines.Pipe.GetReadAsyncResult() at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContext.WriteBody(Boolean flush)

Thanks for any suggestions.