Tried different browser, but the “add” and “remove” buttons don’t react, so you can’t select the featured gigapans/members for a group.
Workaround: Extract the ajax urls from sourcecode.

Btw: the page navigation at this pages doesn’t work as well.

Roger, just to clarify, are you trying to add gigapans from a featured groups page (http://www.gigapan.com/groups/landing_page) to your group’s gallery?