Plasma 5 boots into a blank black desktop

Hello, I have just upgraded my Fedora 20 box to Plasma 5. I have two problems. 1. I can't use SDDM. System shows booting Fedora 20 - kernel version. It never reaches desktop. KDM works fine. 2. Time to time I book into black background empty desktop. There is nothing on the desktop. No panel, etc. I can still use all the applications using KRunne and window switching Atl-Tab. Any idea how can I resolve these issues especially the second one. -- Regards, Sudhir Khanger. sudhirkhanger.com https://github.com/donniezazen