Visual Studio 2015 Ctrl + D (code duplication) not working (keyboard shortcut scheme issue with Resharper)

RESHARPER is/was the culprit

How to fix:

• reset all Visual Studio settings (Tools > Import and Export Settings > Reset all settings)
• then go to the Resharper > Options > Keyboard & Menus and re-apply the keyboard shortcut scheme.

and now its working again!

Reinstalling ReSharper fixed the issue for me