I have updated to the nvidia 260.19.06 drivers (Bug #629910) which seems to have solved the desktop sluggines issue, however any changes to the xfce appearance settings still do not take effect. The actual xfce component involved is xfce4-appearance-settings (not xfce-settings-manager as mentioned in my original post).
I have updated to the nvidia 260.19.06 drivers (Bug #629910) which seems to have solved the desktop sluggines issue, however any changes to the xfce appearance settings still do not take effect. The actual xfce component involved is xfce4-appearanc e-settings (not xfce-settings- manager as mentioned in my original post).