12.04 gnome. Icons dont drag properly

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http://askubuntu.com – I have a 4 monitor setup with xinerama in seperate X windows. I installed gdm and got rid of the big mouse icon. Somewhere along the way though, icons got screwy. Whenever I try and move them, I have to drag my mouse down for a while. Then the icon appears near the top of the monitor. Side to side doesnt seem to do it. I'd just like to do a full reinstall of the desktop and start from scratch, not sure how to do that. apt-get remove ubuntu-desktop, then install only did a small amount of data. Open to other suggestions as well (HowTos)