Gimp doesn't launch

[Programistagd]

When I try to launch GIMP, I get following error:
"X server found. dri2 connection failed!
Trying to open directly...Device open failed"
And it closes.
Searched for that on the internet and didn't find anything. That's the only app on my PC that crashes in that way.
It started happening around the upgrade from 13.04 to 13.10.

Xorg.conf:
"# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 331.20 (buildmeister@swio-display-x86-rhel47-05) Wed Oct 30 18:20:53 PDT 2013

Section "ServerLayout"
    Identifier "Layout0"
    Screen 0 "Screen0"
    InputDevice "Keyboard0" "CoreKeyboard"
    InputDevice "Mouse0" "CorePointer"
EndSection

Section "Files"
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 "Unknown"
    HorizSync 28.0 - 33.0
    VertRefresh 43.0 - 72.0
    Option "DPMS"
EndSection

Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    VendorName "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier "Screen0"
    Device "Device0"
    Monitor "Monitor0"
    DefaultDepth 24
    SubSection "Display"
        Depth 24
    EndSubSection
EndSection

"

[Quinn Balazs (qbalazs)]

Please attach your xorg.conf to this report, and set the status here back to new once you have done so.

[Programistagd (programistagd)]

Added the report to description, changed status back.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Luc Stepniewski (lstep)]

Here is my xorg.conf file :
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 304.88 (buildd@lamiak) Tue Apr 9 12:26:21 UTC 2013

Section "Monitor"
 Identifier "Monitor0"
 VendorName "Unknown"
 ModelName "Lenovo Group Limited"
 HorizSync 30.0 - 94.0
 VertRefresh 50.0 - 75.0
 Option "DPMS"
 # HorizSync source: edid, VertRefresh source: edid
EndSection

Section "Screen"
 Identifier "Screen0"
 Device "Device0"
 Monitor "Monitor0"
 DefaultDepth 24
 Option "Stereo" "0"
 Option "nvidiaXineramaInfoOrder" "CRT-0"
 Option "metamodes" "CRT: 1920x1200 +1920+0, DFP-1: 1920x1200 +0+0"
 # Removed Option "metamodes" "CRT: 1920x1200 +0+0, DFP-1: 1920x1200 +1920+0"
 SubSection "Display"
  Depth 24
 EndSubSection
EndSection

# commented out by ubuntu-release-upgrader, HAL is now used and auto-detects devices
# Keyboard settings are now read from /etc/default/console-setup
#Section "InputDevice"
# Identifier "Mouse0"
# Driver "mouse"
# Option "Protocol" "auto"
# Option "Device" "/dev/psaux"
# Option "Emulate3Buttons" "no"
# Option "ZAxisMapping" "4 5"
#EndSection

# commented out by ubuntu-release-upgrader, HAL is now used and auto-detects devices
# Keyboard settings are now read from /etc/default/console-setup
#Section "InputDevice"
# Identifier "Keyboard0"
# Driver "kbd"
# # generated from default
#EndSection

Section "ServerLayout"
 Identifier "Layout0"
 Screen 0 "Screen0" 0 0
# commented out by ubuntu-release-upgrader, HAL is now used and auto-detects devices
# Keyboard settings are now read from /etc/default/console-setup
# InputDevice "Keyboard0" "CoreKeyboard"
# commented out by ubuntu-release-upgrader, HAL is now used and auto-detects devices
# Keyboard settings are now read from /etc/default/console-setup
# InputDevice "Mouse0" "CorePointer"
 Option "Xinerama" "0"
EndSection

Section "Device"
 Identifier "Device0"
 Driver "nvidia"
 VendorName "NVIDIA Corporation"
 BoardName "GeForce GTX 460M"
 Option "NoLogo" "True"
EndSection