Hi Steve,
In
6.1.3, significant changes to DevForce entities were made in order to officially support Code First. These changes more than likely triggered the change in debugger behavior you're seeing. Unfortunately, you can't restore the previous behavior without rolling back to 6.1.2 or earlier.
I will open a feature request for this.
Edited by DenisK - 17-Apr-2012 at 12:33pm