title: Blend is not working after upgrading to Visual Studio 2015 Community RTM from Visual Studio 2015 RC
body: <p>Trying to start Blend by using menu View->Design in Blend from IDE. <br>Blend successfully started after few freezes and crashes, but appears that there is no any project opened - solution explorer is empty. After this, while trying to close Blend window I get an error "Object reference not set to an instance of an object"...<br>
  Also tried to start Blend from Start-> Blend for Visual Studio 2015. Doing this I get at least three error messages saying that some of the packages couldn`t be found. Blend started successfully, but while trying to open my project I get a detailed message saying that my project somehow is not compatible with Blend... This is stupid because it was created and maintained in VS 2015RC.
  Any ideas?</p>