cowperc

I found a couple blogs that had suggestions, and sort of combined the two. I ended up deleting the code that’s referenced in the first post, and replaced it with this:

/* Captions */
.aligncenter,
div.aligncenter {
	display: block;
	margin-left: auto;
	margin-right: auto;
}

.wp-caption {
	border: 1px solid #ddd;
	text-align: center;
	background-color: #f3f3f3;
	padding-top: 4px;
	margin: 10px;
	-moz-border-radius: 3px;
	-khtml-border-radius: 3px;
	-webkit-border-radius: 3px;
	border-radius: 3px;
}

.wp-caption img {
	margin: 0;
	padding: 0;
	border: 0 none;
}

.wp-caption p.wp-caption-text {
	font-size: 11px;
	line-height: 17px;
	padding: 0 4px 5px;
	margin: 0;
}
/* End captions */

img.centered, .aligncenter, div.aligncenter {
display: block;
margin-left: auto;
margin-right: auto;
}

img.alignright {
padding: 4px;
margin: 0 0 2px 7px;
display: inline;
}

img.alignleft {
padding: 4px;
margin: 0 7px 2px 0;
display: inline;
}

.alignright {
float: right;
}

.alignleft {
float: left;
}

That seemed to do the trick. I have no idea how or why.