The problem is also present with restricted-manager. When nvidia legacy driver is installed it cannot handle composite extension. So, either composite should be disabled with driver installation or
Option "AllowGLXWithComposite" "true"
should be added to Device section in xorg.conf .
So, I can confirm the bug. It was present in edgy and now in Feisty it's still there.
The problem is also present with restricted-manager. When nvidia legacy driver is installed it cannot handle composite extension. So, either composite should be disabled with driver installation or
Option "AllowGLXWithCo mposite" "true"
should be added to Device section in xorg.conf .
So, I can confirm the bug. It was present in edgy and now in Feisty it's still there.