I had absolutely no success running any gpugrid tasks on my Linux installs with the previous driver (302.17) and a GTX 670, and was eagerly anticipating a new driver. In the meantime, I had installed debian wheezy since it still had driver version 295.59 in the repos, and that seemed to work all right. The other day, driver version 304.32 was rolled out to the arch linux repos, and after testing it out a bit I can say, it works! Not only does it work, but it seems to have shaved a good 10-20 minutes off my compute time for the cuda 4.2 tasks. Has anyone else tried using this driver yet?

My GTX680 is using 304.32 drivers and kernel 3.4.7.1-ARCH.
Now everything works !!