Screensaver won't start

[gnerdman]

I'm having a problem with my screensaver not starting. It tries, I can see the screen blank out for a second when it tries to kick in, but then the desktop comes right back. I'm using the latest Nvidia driver with a GeForce 8400 GS, dual headed with Xinerama. Here's my xorg.conf:

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 260.19.12 (buildmeister@builder101) Fri Oct 8 11:47:04 PDT 2010

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 1.0 (buildd@yellow) Fri Apr 9 11:51:21 UTC 2010

Section "ServerLayout"
  Identifier   "Layout0"
  Screen   0 "Screen0" 0 0
  Screen   1 "Screen1" RightOf "Screen0"
  InputDevice  "Keyboard0" "CoreKeyboard"
  InputDevice  "Mouse0" "CorePointer"
  Option     "Xinerama" "1"
EndSection

Section "Files"
EndSection

Section "ServerFlags"
  Option     "BlankTime" "3"
  Option     "StandbyTime" "5"
  Option     "SuspendTime" "20"
  Option     "OffTime" "30"
EndSection

Section "InputDevice"

  # generated from default
  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   "ViewSonic VX1962wm"
  HorizSync    30.0 - 82.0
  VertRefresh   50.0 - 75.0
  Option     "DPMS"
EndSection

Section "Monitor"

  Identifier   "Monitor1"
  VendorName   "Unknown"
  ModelName   "Acer V173"
  HorizSync    30.0 - 83.0
  VertRefresh   56.0 - 75.0
  Option     "DPMS"
EndSection

Section "Device"
  Identifier   "Device0"
  Driver     "nvidia"
  VendorName   "NVIDIA Corporation"
  BoardName   "GeForce 8400 GS"
  BusID     "PCI:1:0:0"
  Screen     0
EndSection

Section "Device"
  Identifier   "Device1"
  Driver     "nvidia"
  VendorName   "NVIDIA Corporation"
  BoardName   "GeForce 8400 GS"
  BusID     "PCI:1:0:0"
  Screen     1
EndSection

Section "Screen"

# Removed Option "metamodes" "DFP: nvidia-auto-select +0+0"
  Identifier   "Screen0"
  Device     "Device0"
  Monitor    "Monitor0"
  DefaultDepth  24
  Option     "TwinView" "0"
  Option     "metamodes" "DFP: 1600x1024 +0+0"
  SubSection   "Display"
    Depth    24
  EndSubSection
EndSection

Section "Screen"

# Removed Option "metamodes" "CRT: nvidia-auto-select +0+0"
  Identifier   "Screen1"
  Device     "Device1"
  Monitor    "Monitor1"
  DefaultDepth  24
  Option     "TwinView" "0"
  Option     "metamodes" "CRT: 1280x1024 +0+0"
  SubSection   "Display"
    Depth    24
  EndSubSection
EndSection

Can anyone help? Thanks in advance.

Mike