At least with Inkscape 0.91 Reproducible: Always Steps to Reproduce: 1.Have the same setup as described in the link 2.Open the about dialog 3.close the dialog Actual Results: CRASH The link offers a ready to use patch. I run Inkscape in gdb and it pointed libqtcurve as the source of the segfault as well.
+*qtcurve-1.8.18-r1 (16 Jul 2015) + + 16 Jul 2015; Lars Wendler <polynomial-c@gentoo.org> + +qtcurve-1.8.18-r1.ebuild, +files/qtcurve-1.8.18-gtk2_segfault.patch: + Revbump to fix a segfault in the gtk2 theme (bug #549292). +