Re: 7667 issues; black screen/ X windows crashing
I solved this problem on my system (Kubuntu - Debian Hoary-5.04) by removing all of the nvidia packages except nvidia-settings. In Kynaptic (or Synaptic) do a search on nvidia and remove everything except nvidia-settings. Then uninstall the nVidia drivers using the nVidia installer (sudo ./NVIDIA-Linux-x86-1.0-7667-pkg1.run --uninstall). Then re-install with the nVidia installer (sudo ./NVIDIA-Linux-x86-1.0-7667-pkg1.run). This worked for me. Hope it helps.