Hi,

I believe I am having the same problem.  While I could get avogadro working 
nicely on my mac, an ubuntu 12.04 installation either from the ubuntu-repo or 
compiling from source-code from https://github.com/dlonie/avogadro (needed for 
installing xtalopt.  I followed the installation directions in 
http://xtalopt.openmolecules.net/wiki/index.fcgi/wiki/Installation and all 
dependencies were installed using 'sudo apt-get') without any errors gives me 
an executable which prints the following lines when run, and doesn't pop-up  a 
GUI window.  I do see a avogadro thumbnail on the launcher in ubuntu, but 
clicking it doesn't produce a GUI window.  The execution hangs in the terminal 
after printing the lines below.  Same happens when run as root except for a few 
less errors printed to terminal.

I have nvidia video card, and I have updated all drivers as well as programs 
installed in the computer using apt-get upgrade.

Does anyone have any suggestions?  Also, I see that some folks have 
successfully installed in ubuntu, can they say if they did that in v12.04 and 
if their video card is nvidia?  For Qt I installed version 4 using apt-get 
install qt4* .    Is there anyone with a successful recent ubuntu installation 
who can post the installation 'recipe' ? (again, I used the one from here 
http://xtalopt.openmolecules.net/wiki/index.fcgi/wiki/Installation and didn't 
get any errors during compilation/installation.) .

Thank you for your suggestions.

Text printed to terminal before hanging without a GUI window:

"Avogadro version:    1.1.0    Git:
LibAvogadro version:    1.1.0    Git:    "
Locale:  "en_US"
Libavogadro translations not found.
System has OpenGL support.
About to test OpenGL capabilities.
OpenGL capabilities found:
    Double Buffering.
    Direct Rendering.
    Antialiasing.
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"" under id 62
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"" under id 63
Loading plugins: "/home/g5q/bin/../lib/avogadro/1_1"
Searching for plugins in "/home/g5q/lib/avogadro/1_1"
Searching for plugins in "/home/g5q/lib/avogadro/1_1/colors"
Searching for plugins in "/home/g5q/lib/avogadro/1_1/engines"
Searching for plugins in "/home/g5q/lib/avogadro/1_1/extensions"
Searching for plugins in "/home/g5q/lib/avogadro/1_1/tools"
Searching for plugins in "/home/g5q/lib/avogadro/1_1/contrib"
Loading plugins: "/home/g5q/.avogadro/1_1/plugins"
Settings are missing for the next engines: ("Ball and Stick", "Axes", 
"Cartoon", "Dipole", "Force", "Hydrogen Bond", "Label", "Polygon", "QTAIM", 
"Ribbon", "Ring", "Simple Wireframe", "Van der Waals Spheres", "Stick", 
"Surfaces", "Wireframe")
QStackedLayout::setCurrentWidget: Widget 0x292af60 not contained in stack
dev warning: Extension "GAMESS" is using a deprecated DockWidget loading 
method. See Extension::dockWidgets() documentation.
dev warning: Extension "Orbitals" is using a deprecated DockWidget loading 
method. See Extension::dockWidgets() documentation.
dev warning: Extension "Vibration" is using a deprecated DockWidget loading 
method. See Extension::dockWidgets() documentation.
GLWidget initialisation...
GLWidget initialised...
createObjects()
libpng warning: Ignoring attempt to set cHRM RGB triangle with zero area

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