Genericon'd – horizontal line through icon????

I’m using the plugin “Genericon’d” and in Twenty Twelve the icons are displaying with a horizontal line through them: http://marginalia.wendysahl.com

I have not had any trouble using them in Twenty Thirteen.

Right now I have the following CSS (in a child theme):

.genericond {
  display: inline;
  vertical-align: bottom;
}

.genericon-2x {
  font-family: Genericons;
  font-style: normal;
  font-variant: normal;
  font-weight: normal;
  font-size: 32px;
  line-height: 1;
  font-size-adjust: none;
  font-stretch: normal;
}
aside#text-2 #smicons a i {
	text-decoration: none;
	padding-right: 10px;
	padding-right: 0.71428571rem;
}