Same thing is happening to me. I have done a fresh install of LM 14 cinnamon twice. During the first install I chose the auto login option yet during my first boot it asked for a name and pass. I entered my name and pass. it would try to login and repeatedly asked me for my user name and pass. So I reinstalled it and went ahead with the option to use my name and pass this time but still have the same result. I'm using an 8gig sancruiser USB drive to install this. I have also used this USB drive for a previous install of LM 14 KDE on the same HDD that I am trying to install LM 14 cinnamon on.
This is a 64 bit install.
Any help would be appreciated.
My problem was solved through this linkviewtopic.php?f=46&t=122257