Me too. I lost everything a few days ago. Adobe help desk sent me this: http://helpx.adobe.com/digital-publishing-suite/kb/missing-folios-view er-application-digital.html. Although none of the suggestios worked for me.
we're having the same problem
if you publish them as private and sign into the viewer with your email etc then they show up
I think it may be a sneaky way of limiting how much people can do with a free account