We developed an interactive tool for our website using lightbox. The main interface of the tool is an image area map. The links for the different "actions" should produce a popup as a lightbox. They don't work for IE11 on Windows 8.1 preview. They worked fine for IE10 and earlier along with Chrome, Firefox, etc. These links use the image map area tag. Other links using the <a> tag and lightbox on that page work fine.
Here's a link to the tool: http://www.c2es.org/pev-action-tool/pev-action-tool-map