Login screen issue happened after I built design suite iso (currently 1.2GB without LibreOffice) for testing purpose. After pressing enter to authenticate, the session will return to the login screen. I looked at the design ks file from git master and it appears the bugs is from either fedora-live-base or fedora-live-base ks. It is very similar to the issue reported by an user for F18 design spin. I also successfully reproduced the same issue after rebuilding the Live Desktop spin locally.
Luya