[jgme]

I dont know if anyone else has done this but I have a Acer R1600 and was having the freezing problem also. I logged out of xbmc and logged into xbmcbuntu, opened the terminal and added the x-updates ppa to update to the latest nvidia driver. You will have to do a apt-get dist-upgrade because the apt-get will report that the drivers have been kept back but after the dist-upgrade they will all install. So its

sudo add-apt-repository ppa:ubuntu-x-swat/x-updates
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

No sure if this fixes the freezing, only been testing for a few hours but no freezes yet.

Edit: Nevermind just read the post a few comments back :-P