Hello,
I found some wrong information in the Scrivener Manual (probably just not updated yet). I figured the ‘bughunting’ forum was not a good place for remarks like this, so that’s why I put it here.
p.99 of the Scrivener manual contains 13.4.1. ‘The Ruler’. It directs you to View>Layout>Show (Hide) Ruler, or Ctrl-R. I couldn’t find the Ruler option there, so I started clicking around and found it under Format>Show Ruler, or Ctrcl+Shift+R.
Just fyi. 
With kind regards,
Reile Meyers