I'm running Ubuntu 9.10 x64 with a Nvidia 9800GT. I had a kernel update today (to 2.6.31-16) and after a restart every unit GPUGrid started died on start with the same error:

<core_client_version>6.10.17</core_client_version>
<![CDATA[
<message>
process exited with code 1 (0x1, -255)
</message>
<stderr_txt>
# Using CUDA device 0
# There is 1 device supporting CUDA
# Device 0: "GeForce 9800 GT"
# Clock rate: 1.50 GHz
# Total amount of global memory: 536543232 bytes
# Number of multiprocessors: 14
# Number of cores: 112
Cuda error in file '../cuda/cutil.h' in line 964 : initialization error.

</stderr_txt>
]]>

Thanks.That did the trick (190 from NVidia site). I installed it yesterday before my post, but since i couldn't get any new work i couldn't check on it.
It might be a good idea to change the restriction of WU's to, say, 2/h instead 10/day, in case something like this happens to somebody else. My GPU went cold for a day...

Anyway, keep up the good work, and we'll keep crunching.

it's a good habbit to "reinstall" driver after kernel update.

In fact, you need to biuld modules for new kernel only, but do not bother and just reinstall driver
____________

Well, the first driver was installed by Ubuntu (i just clicked on "use proprietary drive"), so the kernel module was rebuild after the update, and the driver worked. It just didn't work with GPUGrid.