Livna drivers can be debated... It largely depends if you want to build the drivers yourself, etc...
Personally I use the manufacturer-supplied packages. For NVIDIA I use the installer and with the ATI drivers I use the buildpkg ability.
Are you using the NVIDIA.com drivers or Livna?
Do you have Composite enabled in your xorg.conf? (WIth NVIDIA you can have it enabled, and should).
When you start Beryl what is the output?