Create page of themes with Advanced Theme Switcher

I would like to have a page showing all themes available; a screenshot, the description of each theme, and a link to the demo. Is there a short code available for Advanced Theme Switcher to do this?

I've tried four other plugins where the theme info shows fine, but the theme screenshot does not display. It looks like the proper link but no picture. (All theme screenshots show fine in admin panel> Appearance> Themes.) Any thoughts?
Chuck S.
WPMU, Multi-DB.