X11 Zoom problem

I've been cleaning up a SuSE 7.3 install adding software not included on the CDs etc and I've hit an odd problem. I can't seem to use Ctrl+Alt+KeypadMinus/Plus to zoom in X, which is really useful when getting videos fullscreen without a decent graphics card (which I'll be doing for another computer I'm setting up with an onboard chipset)

I checked the XF86Config and the "DontZoom" option in ServerFlags isn't in there, and there are two modes defines in the config.... so what else could cause this?

The XF86Config file in full:
------------
# /.../
# SaX generated XFree86 config file
# Created on: 2002-03-04.
#
# Version: 4.3
# Contact: Marcus Schaefer <sax@suse.de>, 2001
#
# Automatically generated by [ISaX] (4.3)
# PLEASE DO NOT EDIT THIS FILE!
#
Section "Files"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/local"
FontPath "/usr/X11R6/lib/X11/fonts/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/Type1"
FontPath "/usr/X11R6/lib/X11/fonts/URW"
FontPath "/usr/X11R6/lib/X11/fonts/Speedo"
FontPath "/usr/X11R6/lib/X11/fonts/PEX"
FontPath "/usr/X11R6/lib/X11/fonts/cyrillic"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/Type1"
FontPath "/usr/X11R6/lib/X11/fonts/latin7/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/baekmuk:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/japanese:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/kwintv"
FontPath "/usr/X11R6/lib/X11/fonts/truetype"
FontPath "/usr/X11R6/lib/X11/fonts/uni"
FontPath "/usr/X11R6/lib/X11/fonts/CID"
FontPath "/usr/X11R6/lib/X11/fonts/ucs/misc"
FontPath "/usr/X11R6/lib/X11/fonts/ucs/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/ucs/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/Type1"
FontPath "/usr/X11R6/lib/X11/fonts/misc/sgi"
FontPath "/usr/X11R6/lib/X11/fonts/xtest"
ModulePath "/usr/X11R6/lib/modules"
RgbPath "/usr/X11R6/lib/X11/rgb"
EndSection

Section "ServerFlags"
Option "AllowMouseOpenFail"
EndSection

Section "Module"
Load "dbe"
Load "type1"
Load "speedo"
Load "extmod"
Load "freetype"
Load "glx"
EndSection

Section "InputDevice"
Driver "keyboard"
Identifier "Keyboard[0]"
Option "Protocol" "Standard"
Option "XkbKeyCodes" "xfree86"
Option "XkbLayout" "gb"
Option "XkbModel" "pc104"
Option "XkbRules" "xfree86"
EndSection

Section "InputDevice"
Driver "mouse"
Identifier "Mouse[1]"
Option "Device" "/dev/input/mice"
Option "Name" "AutoDetected"
Option "Protocol" "imps/2"
Option "Vendor" "AutoDetected"
Option "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
HorizSync 27-66
Identifier "Monitor[0]"
ModelName "AutoDetected"
VendorName "AutoDetected"
VertRefresh 50-60
UseModes "Modes[0]"
EndSection

Section "Modes"
Identifier "Modes[0]"
Modeline "640x480" 27.96 640 656 720 864 480 480 485 501
Modeline "1280x1024" 102.24 1280 1296 1552 1664 1024 1024 1034 1070
EndSection

Section "Screen"
DefaultDepth 16
SubSection "Display"
Depth 16
Modes "1280x1024" "640x480"
EndSubSection
Device "Device[0]"
Identifier "Screen[0]"
Monitor "Monitor[0]"
EndSection

Section "Device"
Driver "nvidia"
Identifier "Device[0]"
Option "dpms"
Screen 0
EndSection

Section "ServerLayout"
Identifier "Layout[all]"
InputDevice "Keyboard[0]" "CoreKeyboard"
InputDevice "Mouse[1]" "CorePointer"
Option "Clone" "off"
Option "Xinerama" "off"
Screen "Screen[0]"
EndSection

Section "DRI"
Group "video"
Mode 0660
EndSection
------------