Thanks to ville palo.
That fixed it for me.
This is my modified /etc/x11/xorg.conf section:
Section "Device"
Identifier "nVidia Corporation C51 [Geforce 6150 Go]"
Boardname "nv"
Busid "PCI:0:5:0"
Driver "nvidia"
Option "AllowGLXWithComposite" "true"
Option "RenderAccel" "true"
Option "NoLogo" "True"
Option "AddARGBGLXVisuals" "True"
Screen 0
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window title bar disappears completely on all windows
https://bugs.launchpad.net/bugs/148958
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