Hey Tim,
This is a limitation of the Instagram API unfortunately. You could recreate the checkmark though by following these directions:
1) Add a class to the feed: [instagram-feed class=”verified”]
2) Add the following to the plugin’s Custom JavaScript section:
$(‘.verified .sb_instagram_header h3’).append(‘<span class=”sb_verified”></span>’);
3) Add the following to the Custom CSS section:
.sb_verified {
background-image: url(//instagramstatic-a.akamaihd.net/h1/sprites/core-sprites-6625b8.png);
background-repeat: no-repeat;
background-position: -411px -409px;
height: 18px;
width: 18px;
display: block;
float: right;
margin-left: 3px;
}