CUDA installation on Ubuntu Server 10.04 64bit

Moving from CUDA 3.2RC to CUDA 3.2 (and related driver) I’ve experimented a problem…I’m not able anymore to run properly any CUDA or OpenCL program on Ubuntu Server 10.04 LTS 64 bit.
With version 3.2RC I was able to do it with no side effects but now, with version 3.2 on Ubuntu Server, I get a freeze of the screen immediately after having (succesfully) run a program.
Are there changes in the setup procedure on Ubuntu Server (without X server and window manager installed/running).
I did everything defined in the documentation available on the NVIDIA website (including the script to define the nvidia devices under the /dev folder).

Any idea where to investigate ?

Thank you,