Just installed 3.9.1-saucy, again.
SOURCE: http://kernel.ubuntu.com/~kernel-ppa.../v3.9.1-saucy/
This time, I didn't take any chances and re-installed nVidia/nVidia-settings 304.88 before doing a cold-boot.
I dunno. In the past, when you installed a kernel, you could see the initial nVidia module being built. At least this way (re-installing nVidia et al) I get some indication of what's going on.
Code:
Current Date/Time: Wed May 8 19:55:50 MST 2013
Distro Release: Ubuntu Saucy Salamander (development branch)
Kernel Release: Linux 3.9.1-030901-generic
Gnome Release: GNOME Shell 3.9.1
Unity Release: unity 7.0.0
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce 7600 GT/AGP/SSE2
OpenGL version string: 2.1.2 NVIDIA 304.88