I recently upgraded Visual Studio Community Edition from 2013 to 2015, following a NAV upgrade to 2017 CU3 which now supports 2015.
Opening my first report, it didn’t display. All I saw was a load of XML code. To resolve you need to install “Microsoft SQL Server Data Tools” by re-running the Visual Studio installer (select Change from Programs & Features).
It took ages to install. I was stuck looking at this screen and wondering if it was ever going to complete. Eventually it did.