I can reproduce this. It only happens when I keep the mouse on top of the progress bar window. Cause seems to be bug with wxBusyCursor in wxWidgets 3.0.1. Program received signal SIGSEGV, Segmentation fault. 0x00007ffff5010569 in gdk_cursor_ref () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0 (gdb) bt #0 0x00007ffff5010569 in gdk_cursor_ref () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0 #1 0x00007ffff5032ef1 in gdk_window_set_cursor () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0 #2 0x00007ffff6e548da in wxWindow::GTKUpdateCursor(bool, bool) () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-3.0.so.0 #3 0x00007ffff6e20275 in ?? () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-3.0.so.0 #4 0x00007ffff6e20f16 in ?? () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-3.0.so.0 #5 0x00007ffff6e21081 in wxEndBusyCursor() () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-3.0.so.0 #6 0x00007fffda596245 in DIALOG_DRC_CONTROL::OnStartdrcClick (this=0x3ea1970, event=...) at /home/henrik/koodi/kicad.bzr/pcbnew/dialogs/dialog_drc.cpp:172 #7 0x00007ffff67668be in wxAppConsoleBase::CallEventHandler(wxEvtHandler*, wxEventFunctor&, wxEvent&) const () from /usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0 #8 0x00007ffff68f8368 in wxEvtHandler::ProcessEventIfMatchesId(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&) () from /usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0 #9 0x00007ffff68f8756 in wxEvtHandler::SearchDynamicEventTable(wxEvent&) () from /usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0 #10 0x00007ffff68f87de in wxEvtHandler::TryHereOnly(wxEvent&) () from /usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0 #11 0x00007ffff68f88a3 in wxEvtHandler::ProcessEventLocally(wxEvent&) () from /usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0 #12 0x00007ffff68f8905 in wxEvtHandler::ProcessEvent(wxEvent&) () from /usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0 #13 0x00007ffff68f8677 in wxEvtHandler::SafelyProcessEvent(wxEvent&) () from /usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0 #14 0x00007ffff6e9d3e1 in ?? () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-3.0.so.0 #15 0x00007ffff4daf474 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #16 0x00007ffff4dc9057 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #17 0x00007ffff4dc99af in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #18 0x00007ffff5333425 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 #19 0x00007ffff4daf245 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #20 0x00007ffff4dc080b in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #21 0x00007ffff4dc9748 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #22 0x00007ffff4dc99af in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #23 0x00007ffff5332319 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 #24 0x00007ffff53d8c0f in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 #25 0x00007ffff4daf245 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #26 0x00007ffff4dc0e32 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #27 0x00007ffff4dc9255 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #28 0x00007ffff4dc99af in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #29 0x00007ffff54f02fc in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 #30 0x00007ffff53d7354 in gtk_propagate_event () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 #31 0x00007ffff53d77eb in gtk_main_do_event () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 #32 0x00007ffff504b76c in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0 #33 0x00007ffff466ac5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #34 0x00007ffff466af48 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #35 0x00007ffff466b272 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #36 0x00007ffff53d6747 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 #37 0x00007ffff6e2b9a5 in wxGUIEventLoop::DoRun() () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-3.0.so.0 #38 0x00007ffff67aa380 in wxEventLoopBase::Run() () from /usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0 #39 0x00007ffff6768ab6 in wxAppConsoleBase::MainLoop() () from /usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0 #40 0x000000000043f52f in APP_KICAD::OnRun (this=0x775c80) at /home/henrik/koodi/kicad.bzr/kicad/kicad.cpp:274 #41 0x00007ffff67ff61d in wxEntry(int&, wchar_t**) () from /usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0 #42 0x000000000043d70c in main (argc=1, argv=0x7fffffffdcd8) at /home/henrik/koodi/kicad.bzr/kicad/kicad.cpp:306 Application: kicad Version: (2015-04-10 BZR 5593)-product Debug build wxWidgets: Version 3.0.1 (debug,wchar_t,compiler with C++ ABI 1002,GCC 4.9.1,wx containers,compatible with 2.8) Platform: Linux 3.16.0-31-generic x86_64, 64 bit, Little endian, wxGTK Boost version: 1.54.0 USE_WX_GRAPHICS_CONTEXT=OFF USE_WX_OVERLAY=OFF KICAD_SCRIPTING=ON KICAD_SCRIPTING_MODULES=ON KICAD_SCRIPTING_WXPYTHON=ON USE_FP_LIB_TABLE=HARD_CODED_ON BUILD_GITHUB_PLUGIN=ON KICAD_USE_WEBKIT=OFF