Fonts don't display in the STEP physics simulator under Gnome

[ubugnu]

Hello,
I've installed STEP physics simulator, I loved it but fonts won't to appear
in the simulator screen, instead of having this
http://edu.kde.org/step/pics/gas1.png I have this
http://3.bp.blogspot.com/_uGcgLiQvkI8/TR3MkUle8gI/AAAAAAAAANM/dOMw6bUrR9M/s1600/Capture.png
Thanks for any help


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