Debugging Views in MVC not working in RC2

Hi Guys

I recently updated my asp.net core 1.0 webapp to RC2. Since then I can't debug any MVC Views. 
If I set a breaking point in the view and start the application with f5, navigate to my controllers that calls my view the BP doesn't get hit. 
There is a msg like: could not load symbols for this document. (don't have the exact msg in english bc i'm using the german version uf vs)

debugging the controller or any other class works just fine.

any idea?

greets
s-master