[kde-linux] kubuntu 12.04 Problem: Cannot enable Desktop Effects

[Bumpymail]

Installed kubuntu 12.04 from a LiveCD.
Kubuntu auto installed my Nvidia GeForce GTX 550 Ti set to TwinView.
PROBLEM: On opening System Settings-Desktop effects Cannot enable Desktop 
Effects: Message: "Required X extensions (XComposite and XDamage) are not 
available.". 
Ran utility "Additional Drivers":
Gave option to update to NVIDIA accelerated drivers - see info below.
Installed May 12 2012
NVIDIA accelerated graphics driver (post-release updates) (version current-
updates)
3D-accelerated proprietary graphics driver for NVIDIA cards. Required if you 
want to run Unity.
b]This driver is required to fully utilise the 3D potential of NVIDIA graphics 
cards, as well as provide 2D acceleration of newer cards.
You need to install this driver if you wish to use the Unity desktop, enable 
desktop effects, or run software that requires 3D acceleration, such as some 
games.[/b]
On reboot, ARandR crashed. Sent a bug report (seems it has a history of doing 
this)

xorg.conf:
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 295.33 (buildd at allspice) Fri Mar 30 15:25:24 UTC 
2012
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" RightOf "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "1"
# Removed Option "Xinerama" "0"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"

# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Ancor Communications Inc ASUS MS238"
HorizSync 30.0 - 85.0
VertRefresh 55.0 - 75.0
Option "DPMS"
EndSection
Section "Monitor"
Identifier "Monitor1"
VendorName "Unknown"
ModelName "LG Electronics L1751S"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 75.0
Option "DPMS"
# HorizSync source: edid, VertRefresh source: edid
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 550 Ti"
Option "NoLogo" "True"
BusID "PCI:1:0:0"
Screen 0
EndSection
Section "Device"
Identifier "Device1"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 550 Ti"
Option "NoLogo" "True"
BusID "PCI:1:0:0"
Screen 1
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "0"
Option "TwinViewXineramaInfoOrder" "DFP-0"
Option "metamodes" "DFP: nvidia-auto-select +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection
Section "Screen"
Identifier "Screen1"
Device "Device1"
Monitor "Monitor1"
DefaultDepth 24
Option "TwinView" "0"
Option "TwinViewXineramaInfoOrder" "CRT-1"
Option "metamodes" "CRT: nvidia-auto-select +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection
Section "Extensions"
Option "Composite" "Disable"
EndSection 

Tried to change the line "Option "Composite" "Disable" using
bump at bumpykdeputer:/etc/X11$ sudo chmod a+rw xorg.conf
bump at bumpykdeputer:/etc/X11$ sudo chmod 744 xorg.conf
neither work,  (most unusual as I've done it many times previously)

Sure would appreciate any constructive suggestions for a newbie!