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I'm having the exact same issue, but let me post a bit more information. When scigraphica first starts I get an error for a missing python module:

Importing python module: numarray
ImportError: No module named numarray

Here's some details on what I'm running on.

$ uname -a
Linux localhost.localdomain 2.6.18-1.2200.fc5smp #1 SMP Sat Oct 14 17:15:35 EDT 2006 i686 i686 i386 GNU/Linux

$ rpm -q gtk2
gtk2-2.8.20-1

$ scigraphica --version
sg-2.1.0
Linux 2.6.18-1.2200.fc5smp i686 i686
gtk- gtkextra-
xml- python-2.4.3 /usr/include/python2.4/Numeric/
Apr 10 2007 13:34:18
Compiler flags: gcc -g -O -W -Wall -DWITH_WARNINGS -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/gtkextra-2.0 -I/usr/local/include/scigraphica-2.0 -I/usr/include/libxml2 -I/usr/include/python2.4 -I/usr/include/python2.4/Numeric/ -DWITH_NUMERIC_PYTHON -lxml2 -lz -lm -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lpangocairo-1.0 -lpango-1.0 -lcairo -lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0 -lgtkextra-x11-2.0(C) 2000 Adrian E. Feiguin

Here's the first three lines of the data file I was trying to read in:
18.0 8 307.0 130.0 3504. 12.0 70 1 "chevrolet chevelle malibu"
15.0 8 350.0 165.0 3693. 11.5 70 1 "buick skylark 320"
18.0 8 318.0 150.0 3436. 11.0 70 1 "plymouth satellite"

The screenshots look great, so I'd love to get this app to run. Thanks for your hard work!