from errors.log:

wtf!archive returned 0
[Thu May 13 19:46:29 2010] Found driver: "ALSA driver". Type 1, Version 8.1. Load @0x00b10d40
[Thu May 13 19:46:29 2010] Instantiate address: 0x7f5234c987c0
[Thu May 13 19:46:29 2010] Found driver: "OpenGL Reference GKGL driver". Type 5, Version 82.0. Load @0x00b12c90
[Thu May 13 19:46:29 2010] Instantiate address: 0x7f523457ba30
[Thu May 13 19:46:29 2010] Found driver: "Open Sound System driver". Type 1, Version 8.1. Load @0x00b13eb0
[Thu May 13 19:46:29 2010] Instantiate address: 0x7f5233ee5010
Unable to create GLX context!
Unable to create GLX context!
[Thu May 13 19:46:30 2010] SetVideoMode failed, line 87. mode = 0, oldmode = 0
Fatal Error: Couldn't open window.

Any ideas?

I had this same exact problem about a week or so again. It has a simple fix: reinstall your video driver.

You can see that what is being fouled is the GLX. That would be your OpenGL driver in most cases. If that is true then you only need to reinstall the OpenGL driver.

I have an nVidia card and use the current proprietary driver from nVidia. In my case, I just reinstall just like when I update the kernel.

Yep - reinstalling the Nvidia drivers did the trick. thanks