displayconfig fails to start on Gutsy t5

I'm seeing something similar.
It was previously working fine, then i enabled dual monitor support, with cloned displays, and while X works fine, displayconfig-gtk no longer starts.
I'm using the non-free nvidia driver, and latest displayconfig-gtk from gutsy (0.3.2)

me@my-laptop:~$ sudo displayconfig-gtk
[]
Traceback (most recent call last):
  File "/usr/bin/displayconfig-gtk", line 75, in <module>
    app = DisplayConfig(options)
  File "/usr/lib/python2.5/site-packages/displayconfiggtk/DisplayConfig.py", line 190, in __init__
    debug_scan_pci_filename=self.options.pcitable)
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 392, in __init__
    self._finalizeInit()
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 411, in _finalizeInit
    self.setLayout(gfxcard._getDetectedLayout())
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 965, in setLayout
    gfxcard.setLayout(XSetup.LAYOUT_CLONE)
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 1177, in setLayout
    screen._resyncResolution()
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 1854, in _resyncResolution
    self.gfx_card.setup.getPrimaryScreen()._resyncResolution()
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 1810, in _resyncResolution
    (preferred_width,preferred_height) = self.getAvailableResolutions()[-1]
IndexError: list index out of range

It does not start on my computer either (on Gutsy). I have a slightly different error, but same category:
Traceback (most recent call last):
  File "/usr/bin/displayconfig-gtk", line 75, in <module>
    app = DisplayConfig(options)
  File "/usr/lib/python2.5/site-packages/displayconfiggtk/DisplayConfig.py", line 190, in __init__
    debug_scan_pci_filename=self.options.pcitable)
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 392, in __init__
    self._finalizeInit()
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 397, in _finalizeInit
    gfxcard._finalizeInit()
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 1116, in _finalizeInit
    screen._finalizeInit()
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 1652, in _finalizeInit
    self.settingall) = self._getGammaFromXorg()
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 1696, in _getGammaFromXorg
    elif len(gamma_row.row)==3:
AttributeError: 'list' object has no attribute 'row

I attach the xorg.conf as well (it is messy, cause I used to edit it in many different ways)

I have the same situation. I configured my dual head as a forced 2-screen display, when one is not present at X starting but is forced to be dtetected. This way I can eg. plug in my beamer (projector) and use nvidia-settings to activate the second screen. I don't have to restart, which is a BIG advantage. Prebiously, when the beamer was not connected when X server was starting, it was able to display only 640x480 maximum resolution.

When I try to run displayconfig-gtk 0.3.2 on this configuration I get:

$ displayconfig-gtk
[]
Traceback (most recent call last):
  File "/usr/bin/displayconfig-gtk", line 75, in <module>
    app = DisplayConfig(options)
  File "/usr/lib/python2.5/site-packages/displayconfiggtk/DisplayConfig.py", line 190, in __init__
    debug_scan_pci_filename=self.options.pcitable)
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 392, in __init__
    self._finalizeInit()
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 411, in _finalizeInit
    self.setLayout(gfxcard._getDetectedLayout())
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 965, in setLayout
    gfxcard.setLayout(XSetup.LAYOUT_CLONE)
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 1177, in setLayout
    screen._resyncResolution()
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 1854, in _resyncResolution
    self.gfx_card.setup.getPrimaryScreen()._resyncResolution()
  File "/var/lib/python-support/python2.5/displayconfigabstraction.py", line 1810, in _resyncResolution
    (preferred_width,preferred_height) = self.getAvailableResolutions()[-1]
IndexError: list index out of range

I'm seeing this behavior on a HP ZD7010 using Gutsy 7.10 release (upgrade from Feisty). The application fails to start, and gives the same traceback as described.

Seems to occur when I have a second monitor attached to the laptop. If I remove the second monitor and restart the computer, it comes up fine. Could someone else verify this behavior?

Laszlo Kupcsik: I also had a problem similar to yours: output ending with "AttributeError: 'list' object has no attribute 'row'".
The problem was in my xorg.conf file. Commenting out the Gamma portion of...

Section "Monitor"
        Identifier "monitor2"
       Gamma 0.77 0.67 0.78
EndSection

solved the problem.
I didn't have to restart X or anything. I guess the python script reads the config file each time displayconfig is called.