I just installed Plasma on my new arch installation. Everything was running fine on the fresh install, but after installing Xorg and Plasma, with the CDM display manager, I'm stuck at login. When I login I get a screen asking me to select my DE. I select Plama, then the following text comes up:

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cdm-xlaunch: waiting for ConsoleKit to register X session.
dbus-monitor: unable to enable new-style monitoring: org.freedesktop.DBus.Error>AccessDenied: "Rejected send message, 1 matched rules; type="method_call", sender=":1.6" (uid=1000 pid=610 comm="dbus-monitor --system type=signal,interface=org.fr") interface="org.freedesktop.DBus.Monitoring" member="BecomeMonitor" error name=(unset)" requested_reply ="0" destination="org.freedesktop.DBus" (bus)". Falling back to eavesdropping."

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That text stays up for about a minute, then it goes back to the login prompt, and if I login it just repeats the cycle over and over.

When I saw the "access dienied" error I thought I should try logging in as root. But when I do that I don't get any error messages, there's only a non-flashing cursor at the top-left of the screen. I waited a few minutes and it just stays that way.

Is there a way I can at least login to the terminal to work on this? If not I guess I'll just re-install arch from the .iso file and try to install plasma again. anything I should do different next time? Don't think I need to install any graphics drivers, I think the generic stuff should work on my hardware.

The only way I know of is console mode only-
Press Ctrl+Alt+F2 <Or> Ctrl+Alt+f1.

While your in console mode only you might want to run the dmseg cmd and read through the log.
It might give you more clues as to why your getting the DBus error.

I'm not sure what this means. Try putting the whole message in Google.
Xorg and Plasma may not be playing nice with each other because they may need other dependencies.
Did you install everything that Plasma needs?

https://wiki.archlinux.org/index.php/KDE

-::- If you are already running an X server, use a different display, for example Xorg :2 -configure.-::-
https://wiki.archlinux.org/index.php/Xorg#Configuration

Try removing Xorg and Plasma with pacman. Than install dependencies for Plasma and Xorg and than install Xorg and Plasma and reboot.
If that still doesn't help than you might have to reinstall Arch.