I installed Joomla 3.1.11, then downloaded and installed ja-builder-pkg_1.1.6.zip to the site. I created a page and linked it to the 'Top' menu. When I go to Live Edit, the progress bar just sits there until I refresh the page. Then it comes up, but when I add something to the page, it just says "Saving..." and that never goes away, even if I get out and then back in.
I think I found the answer. I tried Chrome and IE, both had the same problem. Then I downloaded and tried Firefox. Works now! So...the JA devs must use Firefox....