On winXP pre4-2 all 3 scenarios freeze in gdb, bt looks the same but Im including them all here : Program received signal SIGSEGV, Segmentation fault. 0x77c478c0 in strlen () from C:\WINDOWS\system32\msvcrt.dll (gdb) bt #0 0x77c478c0 in strlen () from C:\WINDOWS\system32\msvcrt.dll #1 0x6861cbc3 in _g_gnulib_vasnprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #2 0x6861d8a7 in _g_gnulib_vasprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #3 0x686151a4 in g_vasprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #4 0x686023d6 in g_strdup_vprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #5 0x685ee6a7 in g_logv () from C:\Program Files\inkscape\libglib-2.0-0.dll #6 0x685ee8c6 in g_log () from C:\Program Files\inkscape\libglib-2.0-0.dll #7 0x63a61297 in g_type_check_instance_cast () from C:\Program Files\inkscape\libgobject-2.0-0.dll #8 0x00664a13 in connector_tb_event_attr_changed () #9 0x006a797d in Inkscape::XML::(anonymous namespace)::VectorNodeObserver::noti fyAttributeChanged () #10 0x006a80e3 in Inkscape::XML::CompositeNodeObserver::notifyAttributeChanged () #11 0x004fb2c1 in Inkscape::XML::SimpleNode::setAttribute () #12 0x0042adfa in sp_repr_set_boolean () #13 0x0040c12e in sp_namedview_show_grids () #14 0x00451bf0 in SPDesktop::showGrids () #15 0x00451e25 in SPDesktop::toggleGrids () #16 0x00433851 in Inkscape::ZoomVerb::perform () #17 0x004e7d92 in sp_action_perform () #18 0x63a43945 in g_closure_invoke () from C:\Program Files\inkscape\libgobject-2.0-0.dll #19 0x63a57075 in signal_emit_unlocked_R () from C:\Program Files\inkscape\libgobject-2.0-0.dll #20 0x00000000 in ?? () Program received signal SIGSEGV, Segmentation fault. 0x77c478c0 in strlen () from C:\WINDOWS\system32\msvcrt.dll (gdb) bt #0 0x77c478c0 in strlen () from C:\WINDOWS\system32\msvcrt.dll #1 0x6861cbc3 in _g_gnulib_vasnprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #2 0x6861d8a7 in _g_gnulib_vasprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #3 0x686151a4 in g_vasprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #4 0x686023d6 in g_strdup_vprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #5 0x685ee6a7 in g_logv () from C:\Program Files\inkscape\libglib-2.0-0.dll #6 0x685ee8c6 in g_log () from C:\Program Files\inkscape\libglib-2.0-0.dll #7 0x63a61297 in g_type_check_instance_cast () from C:\Program Files\inkscape\libgobject-2.0-0.dll #8 0x00664a13 in connector_tb_event_attr_changed () #9 0x006a797d in Inkscape::XML::(anonymous namespace)::VectorNodeObserver::noti fyAttributeChanged () #10 0x006a80e3 in Inkscape::XML::CompositeNodeObserver::notifyAttributeChanged () #11 0x004fb2c1 in Inkscape::XML::SimpleNode::setAttribute () #12 0x0042adfa in sp_repr_set_boolean () #13 0x0040c12e in sp_namedview_show_grids () #14 0x00451bf0 in SPDesktop::showGrids () #15 0x00451de4 in SPDesktop::toggleGrids () #16 0x00433851 in Inkscape::ZoomVerb::perform () #17 0x004e7d92 in sp_action_perform () #18 0x63a43945 in g_closure_invoke () from C:\Program Files\inkscape\libgobject-2.0-0.dll #19 0x63a57075 in signal_emit_unlocked_R () from C:\Program Files\inkscape\libgobject-2.0-0.dll #20 0x00000000 in ?? () Program received signal SIGSEGV, Segmentation fault. 0x77c478c0 in strlen () from C:\WINDOWS\system32\msvcrt.dll (gdb) bt #0 0x77c478c0 in strlen () from C:\WINDOWS\system32\msvcrt.dll #1 0x6861cbc3 in _g_gnulib_vasnprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #2 0x6861d8a7 in _g_gnulib_vasprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #3 0x686151a4 in g_vasprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #4 0x686023d6 in g_strdup_vprintf () from C:\Program Files\inkscape\libglib-2.0-0.dll #5 0x685ee6a7 in g_logv () from C:\Program Files\inkscape\libglib-2.0-0.dll #6 0x685ee8c6 in g_log () from C:\Program Files\inkscape\libglib-2.0-0.dll #7 0x63a61297 in g_type_check_instance_cast () from C:\Program Files\inkscape\libgobject-2.0-0.dll #8 0x00664a13 in connector_tb_event_attr_changed () #9 0x006a797d in Inkscape::XML::(anonymous namespace)::VectorNodeObserver::noti fyAttributeChanged () #10 0x006a80e3 in Inkscape::XML::CompositeNodeObserver::notifyAttributeChanged () #11 0x004fb2c1 in Inkscape::XML::SimpleNode::setAttribute () #12 0x0042adfa in sp_repr_set_boolean () #13 0x0040c12e in sp_namedview_show_grids () #14 0x00451bf0 in SPDesktop::showGrids () #15 0x00451e25 in SPDesktop::toggleGrids () #16 0x00433851 in Inkscape::ZoomVerb::perform () #17 0x004e7d92 in sp_action_perform () #18 0x63a43945 in g_closure_invoke () from C:\Program Files\inkscape\libgobject-2.0-0.dll #19 0x63a57075 in signal_emit_unlocked_R () from C:\Program Files\inkscape\libgobject-2.0-0.dll #20 0x00000000 in ?? ()