On the installation It has to do with the video drivers. Have they upped the system Requirements up? Just loaded the December release with no problems. Typed in startx and got error message saying nvidia module wont load.
Start at the beginning, and give a step by step, up to the point where you see the message. Before that, list the specifications for the machine you are trying to install on.
Remember, only you can see your machine, we can't, so all we have to go on is the information you give us. The more detail the better. If you see error messages, quote the entire message. Something like, or it's about, doesn't cut it. We need the exact error message, just as you see it.