Upgrade to Visual Studio 2015 and now can't hit break points in debugging

Question

I have a multi-project solution that I was building in Visual Studio 2013 and it was working fine but now that I have upgraded to Visual Studio 2015 I can no longer hit brea

Answer 1

This sent me insane, until I realised in another solution I set to release configuration, changing it back to debug worked.

This probably isn't your particular answer, but thought I would share it "just in case" someone else gets driven to distraction by something obvious!