Refactor Menu disabled (VS2015)

Hello,

I'm using Visual Studio 2015 (14.0.25123.0) and ReSharper Ultimate 2016.1. Both worked until yesterday. Then I tried using the Ctrl+R R to rename which gave me the error message "The key combination (Ctrl+R, Ctrl+R) is bound to command (.Refactor.Rename) which is not currently available."

The right click menu shows a disabled Refactor menu:

So does the top menu:

Things I tried:

• Restarted VS / Windows
• Updated Visual Studio
• Updated Resharper
• Repaired Resharper
• Reset all settings (via Import and Export Settings Wizard)

Do you have any idea what I could have missed?

Thank you very much!