Update: I found the stylesheet element causing it to not be displayed.
The overflow: hidden was causing the problem. I removed it with no impact to the look of my site. Until I figure out what the conflict was or how to better fix it, I will just leave it out.
/* ----------- Sidebar widget -------------*/
.ngg-widget,
.ngg-widget-slideshow {
/*overflow: hidden;*/
margin:0pt;
padding:5px 0px 0px 0pt;
text-align:left;
}
