I see the same problem with a crash on adding an Offset: Here's the backtrace.
Tav
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[Thread debugging using libthread_db enabled] [New Thread -1208961312 (LWP 6359)]
(inkscape:6359): GLib-CRITICAL **: g_ascii_strtod: assertion `nptr != NULL' failed
Program received signal SIGSEGV, Segmentation fault. [Switching to Thread -1208961312 (LWP 6359)] 0x0817e12b in sp_feOffset_read_number (value=0x0) at sp-feoffset.cpp:116 116 if (*end) { (gdb) bt #0 0x0817e12b in sp_feOffset_read_number (value=0x0) at sp-feoffset.cpp:116 #1 0x0817e1c7 in sp_feOffset_set (object=0xa7656d0, key=101, value=0x0) at sp-feoffset.cpp:135 #2 0x080bff2f in sp_object_read_attr (object=0xa7656d0, key=0x849e9dd "dx") at sp-object.cpp:1060 #3 0x0817e0f9 in sp_feOffset_build (object=0xa7656d0, document=0xa121fa0, repr=0xad648f0) at sp-feoffset.cpp:98 #4 0x080c0243 in sp_object_invoke_build (object=0xa7656d0, document=0xa121fa0, repr=0xad648f0, cloned=0) at sp-object.cpp:853 #5 0x080c23de in sp_object_child_added (object=0xbfc6038, child=0xad648f0, ref=0x0) at sp-object.cpp:710 #6 0x080a19f9 in sp_filter_child_added (object=0xbfc6038, child=0x0, ref=0x0) at sp-filter.cpp:384 #7 0x08468f22 in Inkscape::XML::CompositeNodeObserver::notifyChildAdded (this=0xad64930, node=@0xad64970, child=@0xad648f0, prev=0x0) at xml/composite-node-observer.cpp:32 #8 0x08118894 in Inkscape::XML::SimpleNode::addChild (this=0xad64900, child=0xad648f0, ref=0x0) at xml/simple-node.cpp:399 #9 0x0811aa3f in Inkscape::XML::SimpleNode::appendChild (this=0xad64900, child=0xad648f0) at ./xml/simple-node.h:68 #10 0x08481072 in filter_add_primitive (filter=0xbfc6038, type=0x9faf0ac "svg:feOffset") at filter-chemistry.cpp:124 #11 0x081c0483 in Inkscape::UI::Dialog::FilterEffectsDialog::add_primitive (this=0xbfe24c0) at ui/dialog/filter-effects-dialog.cpp:830 #12 0x0063e57a in Glib::SignalProxyNormal::slot0_void_callback () from /usr/lib/libglibmm-2.4.so.1 #13 0x06a1a0f9 in g_cclosure_marshal_VOID__VOID () from /lib/libgobject-2.0.so.0 #14 0x06a0cd9b in g_closure_invoke () from /lib/libgobject-2.0.so.0 #15 0x06a1d721 in g_signal_chain_from_overridden () from /lib/libgobject-2.0.so.0 #16 0x06a1e957 in g_signal_emit_valist () from /lib/libgobject-2.0.so.0 #17 0x06a1eb19 in g_signal_emit () from /lib/libgobject-2.0.so.0 #18 0x04797d63 in gtk_button_clicked () from /usr/lib/libgtk-x11-2.0.so.0 #19 0x047999ce in gtk_button_set_alignment () from /usr/lib/libgtk-x11-2.0.so.0 #20 0x07cb7e54 in Gtk::Button_Class::released_callback () from /usr/lib/libgtkmm-2.4.so.1 #21 0x06a1a0f9 in g_cclosure_marshal_VOID__VOID () from /lib/libgobject-2.0.so.0 ---Type <return> to continue, or q <return> to quit--- #22 0x06a0b589 in g_value_set_static_boxed () from /lib/libgobject-2.0.so.0 #23 0x06a0cd9b in g_closure_invoke () from /lib/libgobject-2.0.so.0 #24 0x06a1d8ca in g_signal_chain_from_overridden () from /lib/libgobject-2.0.so.0 #25 0x06a1e957 in g_signal_emit_valist () from /lib/libgobject-2.0.so.0 #26 0x06a1eb19 in g_signal_emit () from /lib/libgobject-2.0.so.0 #27 0x04797df3 in gtk_button_released () from /usr/lib/libgtk-x11-2.0.so.0 #28 0x04797e51 in gtk_button_released () from /usr/lib/libgtk-x11-2.0.so.0 #29 0x07d7881b in Gtk::Widget_Class::button_release_event_callback () from /usr/lib/libgtkmm-2.4.so.1 #30 0x04869650 in gtk_marshal_BOOLEAN__VOID () from /usr/lib/libgtk-x11-2.0.so.0 #31 0x06a0b589 in g_value_set_static_boxed () from /lib/libgobject-2.0.so.0 #32 0x06a0cd9b in g_closure_invoke () from /lib/libgobject-2.0.so.0 #33 0x06a1da83 in g_signal_chain_from_overridden () from /lib/libgobject-2.0.so.0 #34 0x06a1e71f in g_signal_emit_valist () from /lib/libgobject-2.0.so.0 #35 0x06a1eb19 in g_signal_emit () from /lib/libgobject-2.0.so.0 #36 0x0497e408 in gtk_widget_get_default_style () from /usr/lib/libgtk-x11-2.0.so.0 #37 0x04862a13 in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0 #38 0x04863c17 in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0 #39 0x03f7847a in gdk_add_client_message_filter () from /usr/lib/libgdk-x11-2.0.so.0 #40 0x0737b442 in g_main_context_dispatch () from /lib/libglib-2.0.so.0 #41 0x0737e41f in g_main_context_check () from /lib/libglib-2.0.so.0 #42 0x0737e7c9 in g_main_loop_run () from /lib/libglib-2.0.so.0 #43 0x04864094 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0 #44 0x07cfe047 in Gtk::Main::run_impl () from /usr/lib/libgtkmm-2.4.so.1 ---Type <return> to continue, or q <return> to quit--- #45 0x07cfde32 in Gtk::Main::run () from /usr/lib/libgtkmm-2.4.so.1 #46 0x080775d9 in sp_main_gui (argc=1, argv=0xbfccd474) at main.cpp:660 #47 0x081909b3 in Inkscape::NSApplication::Application::run (this=0xbfccd3b4) at application/application.cpp:117 #48 0x080773bd in main (argc=1, argv=0xbfccd474) at main.cpp:505 (gdb)