Visual Studio 2015 project no longer runs in debug mode

Question

This is what I get even when I run in the Debug configuration:

The way I got this to show was by enabling "Just My Code" and warn if there

Answer 1

If none of mentioned solutions has helped, check your project's AssemblyInfo.cs for explicit DebuggableAttribute application. It seems like it overrides compiler's debug/release options.

I had this line in the file in my case (legacy project, no idea how it got there). Deleting it solved the problem:

[assembly: System.Diagnostics.Debuggable(System.Diagnostics.DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints)]