Ok... We will need your help in troubleshooting this. It could be related to ATK, or it could be localized to your machine, but to find this out, please follow the steps below.
Start by downloading the attached script
atkpython_debug onto your Linux machine. You will probably need to give it executable permission:
Save a simple test script, like the Ag fcc calculation you indicated before, as a file, let's call it
ag.py. Put it in the same directory as
atkpython_debug.
Then open a terminal, and navigate to the directory where you saved the scripts. At the prompt, type
The script will automatically perform "run", "bt", and "quit" in gdb (the GNU Debugger). When it finishes you are left at the prompt again - send us the information it printed; this will allow us to learn more about this problem.