Visual Diagnostic is either disabled or is not supported by the current application

Question

with VS 2015 Enterprise i get always following message on a solution while debugging: XAML Visual Diagnostic is either disabled or is not supported by the current application

Tools - Options - Debugging - General:

• Enable UI Debugging Tools for XAML is enabled
• Preview selected elements in Live Visual Tree is enabled

I have tried:

• VS Restart
• Clean Solution / Rebuild
• Fresh Checkout

Curious: If i start the solution without debugging and i attach the debugger to the process, it works ...

Update: If i select "Enable native code debugging" in project settings - debug, it works !

Answer 1

I needed an additional debugging option to be disabled in order for the tools to work with my projects:

Tools - Options - Debugging - General:

• Use Managed Compatibility Mode --> disabled

Answer 2

I also faced this problem for some WPF projects that came to my pc from various sources. In my case the problem was in the project target framework - it was set to .NET Framework 3.5. The Live Visual Tree and the Live Property Explorer in VS 2015 do not work with .NET 3.5:

Inspect XAML properties while debugging
https://msdn.microsoft.com/en-us/library/mt270227.aspx

So I just changed the target framework to .NET Framework 4.0 in the project properties dialog (the Application tab) to make these 'live' tools work.