crash running scigraphica 2.1

Hi, testing scigraphica. I open the project simple in the examples
directory and everything is fine when I look at the plot. However, when
I open the worksheet scigraphica crashes with the following message:

(scigraphica:2467): Gtk-WARNING **: gtkwidget.c:7129: widget class
`SGworksheet' has no property named `default_border'
*** glibc detected *** free(): invalid pointer: 0xb72641a8 ***

I am using glibc-2.3.4 and gtk+-2.6.7 in gentoo.

Something very similar also occurred with scigraphica 2.0. I guess is
some type of incompatibility among versions of gtk, or gtkextra (or I am
not using the right version).

Juan


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