[Plugin: SidePosts Widget] Images not displaying in sidebar

I’ve read similar posts about images not displaying and tried some of the fixes suggested, including embedding the images in the post, but I can’t get the thumbnails showing up in the widget.

Test site is at:

http://mediazoic.info/byrnesmedia/

The widget I’m trying to get it to work with is the one entitled “Tips from the Experts”.

http://wordpress.org/extend/plugins/sideposts/