i managed to obtain a backtrace. eidam@eidam-laptop:~$ drapes sh: acroread: not found Wallpaper switch failed; No wallpapers? Wallpaper switch failed; No wallpapers? Wallpaper switch failed; No wallpapers? Stacktrace: at (wrapper managed-to-native) Gtk.Range.gtk_range_get_value (intptr) <0x00004> at (wrapper managed-to-native) Gtk.Range.gtk_range_get_value (intptr) <0xffffffff> at Gtk.Range.get_Value () <0x00024> at Drapes.ConfigWindow.OnSettingTimmerChanged (object,Drapes.Config.SettingsChangeEvent`1) <0x00019> at (wrapper delegate-invoke) Drapes.Config.TimeSettingsChangeHandler.invoke_void__this___object_SettingsChangeEvent`1 (object,Drapes.Config.SettingsChangeEvent`1) <0xffffffff> at Drapes.Config.Settings.set_SwitchDelay (Drapes.Config.Delay/DelayEnum) <0x000a3> at Drapes.ConfigWindow.OnTimerChangeValueEvent (object,Gtk.ChangeValueArgs) <0x00066> at (wrapper runtime-invoke) Drapes.ConfigWindow.runtime_invoke_void__this___object_ChangeValueArgs (object,intptr,intptr,intptr) <0xffffffff> at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke (object,object[],System.Exception&) <0x00004> at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke (object,object[],System.Exception&) <0xffffffff> at System.Reflection.MonoMethod.Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) <0x000a3> at System.Reflection.MethodBase.Invoke (object,object[]) <0x0001a> at System.Delegate.DynamicInvokeImpl (object[]) <0x00170> at System.MulticastDelegate.DynamicInvokeImpl (object[]) <0x0002a> at System.Delegate.DynamicInvoke (object[]) <0x0000e> at GLib.Signal.ClosureInvokedCB (object,GLib.ClosureInvokedArgs) <0x00159> at GLib.SignalClosure.Invoke (GLib.ClosureInvokedArgs) <0x0001b> at GLib.SignalClosure.MarshalCallback (intptr,intptr,uint,intptr,intptr,intptr) <0x00471> at (wrapper native-to-managed) GLib.SignalClosure.MarshalCallback (intptr,intptr,uint,intptr,intptr,intptr) <0xffffffff> at (wrapper managed-to-native) Gtk.Application.gtk_main () <0x00004> at (wrapper managed-to-native) Gtk.Application.gtk_main () <0xffffffff> at Gtk.Application.Run () <0x00007> at Gnome.Program.Run () <0x00007> at Drapes.DrapesApp..ctor (string[]) <0x0038b> at Drapes.DrapesApp.Main (string[]) <0x00019> at (wrapper runtime-invoke) Drapes.DrapesApp.runtime_invoke_void_string[] (object,intptr,intptr,intptr) <0xffffffff> Native stacktrace: drapes [0x806d944] drapes [0x808616b] [0xb7f90410] [0xb5086b9e] [0xb5086b4d] [0xb325838a] [0xb325844f] [0xb32582ec] [0xb325821f] [0xb325814c] drapes(mono_runtime_invoke_array+0x38a) [0x80bd00a] drapes [0x80c50fa] [0xb5dc40f0] [0xb5dc38bc] [0xb5dc3813] [0xb507cff9] [0xb507ce73] [0xb507ce3f] [0xb507ce1a] [0xb507ccb4] [0xb5d03cca] [0xb5dc6ffc] /usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x1ab) [0xb6697c7b] /usr/lib/libgobject-2.0.so.0 [0xb66ae3d2] /usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x64f) [0xb66af34f] /usr/lib/libgobject-2.0.so.0(g_signal_emit+0x26) [0xb66af936] /usr/lib/libgtk-x11-2.0.so.0 [0xb6c846e5] /usr/lib/libgtk-x11-2.0.so.0 [0xb6c86ad0] /usr/lib/libgtk-x11-2.0.so.0 [0xb6c47526] /usr/lib/libgobject-2.0.so.0 [0xb66963d9] /usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x1ab) [0xb6697c7b] /usr/lib/libgobject-2.0.so.0 [0xb66adaff] /usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x64f) [0xb66af34f] /usr/lib/libgobject-2.0.so.0(g_signal_emit+0x26) [0xb66af936] /usr/lib/libgtk-x11-2.0.so.0 [0xb6d622ae] /usr/lib/libgtk-x11-2.0.so.0(gtk_propagate_event+0xec) [0xb6c3ff7c] /usr/lib/libgtk-x11-2.0.so.0(gtk_main_do_event+0x2e7) [0xb6c41327] /usr/lib/libgdk-x11-2.0.so.0 [0xb6ace34a] /usr/lib/libglib-2.0.so.0(g_main_context_dispatch+0x1e8) [0xb7f09b88] /usr/lib/libglib-2.0.so.0 [0xb7f0d0eb] /usr/lib/libglib-2.0.so.0(g_main_loop_run+0x1ca) [0xb7f0d5ba] /usr/lib/libgtk-x11-2.0.so.0(gtk_main+0xb9) [0xb6c417d9] [0xb507d1c6] [0xb507d190] [0xb507d178] [0xb783301c] [0xb7832c62] [0xb782e1b3] drapes(mono_runtime_exec_main+0xe5) [0x80bad75] drapes(mono_runtime_run_main+0x16b) [0x80bb4eb] drapes(mono_main+0x1727) [0x805c917] drapes [0x805ac62] /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7d20775] drapes [0x805aba1] Debug info from gdb: (no debugging symbols found) [Thread debugging using libthread_db enabled] [New Thread 0xb7cd66e0 (LWP 8183)] [New Thread 0xb5cf3b90 (LWP 8466)] [New Thread 0xb4387b90 (LWP 8462)] [New Thread 0xb7435b90 (LWP 8185)] [New Thread 0xb7ec0b90 (LWP 8184)] 0xb7f90430 in __kernel_vsyscall () 5 Thread 0xb7ec0b90 (LWP 8184) 0xb7f90430 in __kernel_vsyscall () 4 Thread 0xb7435b90 (LWP 8185) 0xb7f90430 in __kernel_vsyscall () 3 Thread 0xb4387b90 (LWP 8462) 0xb7f90430 in __kernel_vsyscall () 2 Thread 0xb5cf3b90 (LWP 8466) 0xb7f90430 in __kernel_vsyscall () 1 Thread 0xb7cd66e0 (LWP 8183) 0xb7f90430 in __kernel_vsyscall () Thread 5 (Thread 0xb7ec0b90 (LWP 8184)): #0 0xb7f90430 in __kernel_vsyscall () #1 0xb7ea08f6 in nanosleep () from /lib/tls/i686/cmov/libpthread.so.0 #2 0x081492e8 in ?? () #3 0xb7e994ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 #4 0xb7dee49e in clone () from /lib/tls/i686/cmov/libc.so.6 Thread 4 (Thread 0xb7435b90 (LWP 8185)): #0 0xb7f90430 in __kernel_vsyscall () #1 0xb7e9d0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0 #2 0x0814c607 in ?? () #3 0x0814f1f4 in ?? () #4 0x0814f25c in ?? () #5 0x08169b02 in ?? () #6 0x080d565a in ?? () #7 0x080f7639 in ?? () #8 0x081653b6 in ?? () #9 0x081833b5 in ?? () #10 0xb7e994ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 #11 0xb7dee49e in clone () from /lib/tls/i686/cmov/libc.so.6 Thread 3 (Thread 0xb4387b90 (LWP 8462)): #0 0xb7f90430 in __kernel_vsyscall () #1 0xb7e9d412 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0 #2 0xb7f8a0cd in g_cond_timed_wait_posix_impl (cond=0x8a1f7f0, entered_mutex=0x80, abs_time=0x5) at /build/buildd/glib2.0-2.20.1/gthread/gthread-posix.c:242 #3 0xb7ee3259 in g_async_queue_pop_intern_unlocked (queue=0x85e3008, try=, end_time=0xb4387354) at /build/buildd/glib2.0-2.20.1/glib/gasyncqueue.c:365 #4 0xb7ee3357 in IA__g_async_queue_timed_pop (queue=0x85e3008, end_time=0xb4387354) at /build/buildd/glib2.0-2.20.1/glib/gasyncqueue.c:491 #5 0xb7f35d93 in g_thread_pool_thread_proxy (data=0x8965230) at /build/buildd/glib2.0-2.20.1/glib/gthreadpool.c:121 #6 0xb7f347bf in g_thread_create_proxy (data=0x8965aa8) at /build/buildd/glib2.0-2.20.1/glib/gthread.c:635 #7 0xb7e994ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 #8 0xb7dee49e in clone () from /lib/tls/i686/cmov/libc.so.6 Thread 2 (Thread 0xb5cf3b90 (LWP 8466)): #0 0xb7f90430 in __kernel_vsyscall () #1 0xb7ddde2b in read () from /lib/tls/i686/cmov/libc.so.6 #2 0xb5cf62f5 in ?? () #3 0xb5cf620c in ?? () #4 0xb5dc41d9 in ?? () #5 0x080b8974 in mono_runtime_delegate_invoke () #6 0x080f76bf in ?? () #7 0x081653b6 in ?? () #8 0x081833b5 in ?? () #9 0xb7e994ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 #10 0xb7dee49e in clone () from /lib/tls/i686/cmov/libc.so.6 Thread 1 (Thread 0xb7cd66e0 (LWP 8183)): #0 0xb7f90430 in __kernel_vsyscall () #1 0xb7deaa87 in syscall () from /lib/tls/i686/cmov/libc.so.6 #2 0x0806d9e7 in ?? () #3 0x0808616b in ?? () #4 #5 0xb6c84b0b in gtk_range_get_value () from /usr/lib/libgtk-x11-2.0.so.0 #6 0xb5086b9e in ?? () #7 0xb5086b4d in ?? () #8 0xb325838a in ?? () #9 0xb325844f in ?? () #10 0xb32582ec in ?? () #11 0xb325821f in ?? () #12 0xb325814c in ?? () #13 0x080bd00a in mono_runtime_invoke_array () #14 0x080c50fa in ?? () #15 0xb5dc40f0 in ?? () #16 0xb5dc38bc in ?? () #17 0xb5dc3813 in ?? () #18 0xb507cff9 in ?? () #19 0xb507ce73 in ?? () #20 0xb507ce3f in ?? () #21 0xb507ce1a in ?? () #22 0xb507ccb4 in ?? () #23 0xb5d03cca in ?? () #24 0xb5dc6ffc in ?? () #25 0xb6697c7b in IA__g_closure_invoke (closure=0x2, return_value=0xbfdab7ac, n_param_values=3, param_values=0x8778890, invocation_hint=0xbfdab798) at /build/buildd/glib2.0-2.20.1/gobject/gclosure.c:767 #26 0xb66ae3d2 in signal_emit_unlocked_R (node=0x892f5d0, detail=0, instance=0x8914138, emission_return=0xbfdab8e4, instance_and_params=0x8778890) at /build/buildd/glib2.0-2.20.1/gobject/gsignal.c:3317 #27 0xb66af34f in IA__g_signal_emit_valist (instance=0x8914138, signal_id=206, detail=0, var_args=0xbfdab944 "h�ڿ��>�r��}\220\f\f@\206") at /build/buildd/glib2.0-2.20.1/gobject/gsignal.c:2990 #28 0xb66af936 in IA__g_signal_emit (instance=0x8914138, signal_id=206, detail=0) at /build/buildd/glib2.0-2.20.1/gobject/gsignal.c:3037 #29 0xb6c846e5 in ?? () from /usr/lib/libgtk-x11-2.0.so.0 #30 0xb6c86ad0 in ?? () from /usr/lib/libgtk-x11-2.0.so.0 #31 0xb6c47526 in ?? () from /usr/lib/libgtk-x11-2.0.so.0 #32 0xb66963d9 in g_type_class_meta_marshal (closure=0x0, return_value=0xbfdabb6c, n_param_values=2, param_values=0x8914138, invocation_hint=0xbfdabb58, marshal_data=0xbc) at /build/buildd/glib2.0-2.20.1/gobject/gclosure.c:878 #33 0xb6697c7b in IA__g_closure_invoke (closure=0x8594f18, return_value=0xbfdabb6c, n_param_values=2, param_values=0x897f340, invocation_hint=0xbfdabb58) at /build/buildd/glib2.0-2.20.1/gobject/gclosure.c:767 #34 0xb66adaff in signal_emit_unlocked_R (node=0x85950f8, detail=0, instance=0x8914138, emission_return=0xbfdabca4, instance_and_params=0x897f340) at /build/buildd/glib2.0-2.20.1/gobject/gsignal.c:3285 #35 0xb66af34f in IA__g_signal_emit_valist (instance=0x8914138, signal_id=39, detail=0, var_args=0xbfdabcfc "\024�ڿ�4j\b8A\221\b�\205ֶ8A\221\bH\016]\b") at /build/buildd/glib2.0-2.20.1/gobject/gsignal.c:2990 #36 0xb66af936 in IA__g_signal_emit (instance=0x8914138, signal_id=39, detail=0) at /build/buildd/glib2.0-2.20.1/gobject/gsignal.c:3037 #37 0xb6d622ae in ?? () from /usr/lib/libgtk-x11-2.0.so.0 #38 0xb6c3ff7c in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0 #39 0xb6c41327 in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0 #40 0xb6ace34a in ?? () from /usr/lib/libgdk-x11-2.0.so.0 #41 0xb7f09b88 in IA__g_main_context_dispatch (context=0x8590118) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814 #42 0xb7f0d0eb in g_main_context_iterate (context=0x8590118, block=1, dispatch=1, self=0x846ed40) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448 #43 0xb7f0d5ba in IA__g_main_loop_run (loop=0x86aca10) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2656 #44 0xb6c417d9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0 #45 0xb507d1c6 in ?? () #46 0xb507d190 in ?? () #47 0xb507d178 in ?? () #48 0xb783301c in ?? () #49 0xb7832c62 in ?? () #50 0xb782e1b3 in ?? () #51 0x080bad75 in mono_runtime_exec_main () #52 0x080bb4eb in mono_runtime_run_main () #53 0x0805c917 in mono_main () #54 0x0805ac62 in ?? () #55 0xb7d20775 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6 #56 0x0805aba1 in ?? () #0 0xb7f90430 in __kernel_vsyscall () ================================================================= Got a SIGSEGV while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application. ================================================================= Aborted (core dumped)