Prebuilt Page Panel Suddenly Empty

I’ve built my site www.therustynutbible.com (~200 pages) using Page Builder. Great tool.

I just discovered a page from the early days of the site with no PB template content and went in to Clone another page. But since I last edited stuff a couple of weeks ago something has gone wrong and the Prebuilt Pages panel is empty. All the pages are still there and still have PB content but whatever cache or database you use for this has some glitch.

Emptied my browser cache and tried two different browsers (Safari and Chrome Canary).

I haven’t enabled any additional plugins (though several have been updated).

I’ve got a screen shot… shared Evernote Skitch URL below.

URL: https://www.evernote.com/shard/s2/sh/d52151b4-59c7-424a-aeae-b86d5395f402/09d2e9bcc1a6a5b957e9790f22ebc71e