segfault at redraw(?) after a certain amount of time

following happens both on linux and windows operating systems. on linux it happened while trying to edit a pattern by moving it, on windows similar crash (unfortunately without a backtrace but IMHO 99% the same reason) while dragging an object downwards with Ctrl.

i am using Inkscape 0.46 on both systems.

i managed to get a backtrace:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb4a45760 (LWP 3272)]
0x084d5e85 in sp_paint_selector_get_pattern ()
(gdb) bt
#0 0x084d5e85 in sp_paint_selector_get_pattern ()
#1 0x08411763 in ?? ()
#2 0xb7254238 in g_cclosure_marshal_VOID () from /usr/lib/libgobject-2.0.so.0
#3 0xb7246d42 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#4 0xb725afe8 in signal_emit_unlocked_R () from /usr/lib/libgobject-2.0.so.0
#5 0xb725c35d in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#6 0xb77ea31e in gtk_signal_emit () from /usr/lib/libgtk-x11-2.0.so.0
#7 0x084d6d1a in sp_paint_selector_set_mode ()
#8 0xb725459c in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#9 0xb7246d42 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#10 0xb725afe8 in signal_emit_unlocked_R () from /usr/lib/libgobject-2.0.so.0
#11 0xb725c35d in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#12 0xb725c7d6 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#13 0xb77348fa in gtk_toggle_button_toggled () from /usr/lib/libgtk-x11-2.0.so.0
#14 0xb7734942 in gtk_toggle_button_clicked () from /usr/lib/libgtk-x11-2.0.so.0
#15 0xb725459c in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#16 0xb72453c9 in g_type_class_meta_marshal () from /usr/lib/libgobject-2.0.so.0
#17 0xb7246d42 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#18 0xb725a8f5 in signal_emit_unlocked_R () from /usr/lib/libgobject-2.0.so.0
#19 0xb725c35d in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#20 0xb725c7d6 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#21 0xb75b3e5a in gtk_button_clicked () from /usr/lib/libgtk-x11-2.0.so.0
#22 0xb7734648 in gtk_toggle_button_released () from /usr/lib/libgtk-x11-2.0.so.0
#23 0xb725459c in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#24 0xb72453c9 in g_type_class_meta_marshal () from /usr/lib/libgobject-2.0.so.0
#25 0xb7246d42 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#26 0xb725a8f5 in signal_emit_unlocked_R () from /usr/lib/libgobject-2.0.so.0
#27 0xb725c35d in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#28 0xb725c7d6 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#29 0xb75b3efa in gtk_button_released () from /usr/lib/libgtk-x11-2.0.so.0
#30 0xb75b3f33 in gtk_button_button_release () from /usr/lib/libgtk-x11-2.0.so.0
#31 0xb766c454 in _gtk_marshal_BOOLEAN__BOXED () from /usr/lib/libgtk-x11-2.0.so.0
#32 0xb72453c9 in g_type_class_meta_marshal () from /usr/lib/libgobject-2.0.so.0
#33 0xb7246d42 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#34 0xb725acdb in signal_emit_unlocked_R () from /usr/lib/libgobject-2.0.so.0
#35 0xb725c1e8 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#36 0xb725c7d6 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#37 0xb7784576 in gtk_widget_event_internal () from /usr/lib/libgtk-x11-2.0.so.0
#38 0xb7664f50 in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0
#39 0xb76661c9 in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#40 0xb74f73aa in gdk_event_dispatch () from /usr/lib/libgdk-x11-2.0.so.0
#41 0xb71afd98 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#42 0xb71b33e0 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#43 0xb71b384f in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#44 0xb7666729 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#45 0xb7dd1aa7 in Gtk::Main::run_impl () from /usr/lib/libgtkmm-2.4.so.1
#46 0xb7dd18a2 in Gtk::Main::run () from /usr/lib/libgtkmm-2.4.so.1
#47 0x0821bc3e in sp_main_gui ()
#48 0x08357712 in Inkscape::NSApplication::Application::run ()
#49 0x0821c022 in main ()
(gdb)