We have a visual bug with our logo. The header background is set to transparent initially, then white when it scrolls. The logo appears fine on non-retina screens, but on retina screens the logo disappears on the white background. 

The issue appears to be in the directionalNavColorInit() function in nectar-slider.js. This line forces the theme to use the non-retina logo: 

$($selector+ ' header#top #logo img:first').clone().appendTo($($selector+ ' header#top #logo .original span'));

I was able to fix by checking for retina first:

 if($('.retina-logo:visible').length > 0) {
     $($selector+ ' header#top #logo img.retina-logo:first').clone().appendTo($($selector+ ' header#top #logo .original span'));
 } else {
     $($selector+ ' header#top #logo img:first').clone().appendTo($($selector+ ' header#top #logo .original span'));
 }

This seems to work though I haven't tested thoroughly. Please look into this, thank you.