I'm using an updated Ubuntu 11.10 installation (Nvidia drivers 280.13 version) and I was suffering this bug until I downgraded the video card shared memory from 256 MB to 128 MB, just like Eslam said.
It seems a shared memory issue, with 256 MB configured every animation stop and goes; but with 128 MB, everything works fine.
I'm using an updated Ubuntu 11.10 installation (Nvidia drivers 280.13 version) and I was suffering this bug until I downgraded the video card shared memory from 256 MB to 128 MB, just like Eslam said.
It seems a shared memory issue, with 256 MB configured every animation stop and goes; but with 128 MB, everything works fine.
Regards