Comment 33 for bug 186382

I removed the nvidia-glx-new package, then downloaded the newly released (beta) driver from nvidia.com (released april 10th). After running the installation script, I now have black shadows, and they are consistent :)
yay :)

Unfortunately, this driver is not yet marked as stable, but it fixes the issue for me. Based on this, I suggest that it is either a driver issue related to the driver version in ubuntus repo, or something related to the specific ubuntu package of this driver. However, I never got around to test running the nvidia installer with the latest stable driver, so ...