I haven't found any of your problems...
Besides what exactly do you use Cooker? with the newest X.org?
if yes? try
in xorg.conf
in section screen
Option "AddARGBGLXVisuals" "True"
in section files
ModulePath "/usr/lib/xorg/modules/extensions/nvidia"
ModulePath "/usr/lib/xorg/modules/"
in section module
load "glx"
in section device
option renderaccel "true"
option allowglxwithcomposite "true"
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