Comment 1 for bug 1375085

Backtrace with 0.91pre2 r13566 on OS X 10.7.5 (no debug build available):

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x000000000000010c
0x00000001001ecee4 in SPCanvas::forceFullRedrawAfterInterruptions ()
(gdb) bt
#0 0x00000001001ecee4 in SPCanvas::forceFullRedrawAfterInterruptions ()
#1 0x000000010065289a in Inkscape::UI::Widget::SelectedStyle::on_opacity_changed ()
#2 0x000000010217576f in Glib::SignalProxyNormal::slot0_void_callback ()
#3 0x0000000103379e0d in g_closure_invoke ()
#4 0x000000010338ca37 in signal_emit_unlocked_R ()
#5 0x000000010338d7a2 in g_signal_emit_valist ()
#6 0x000000010338db12 in g_signal_emit ()
#7 0x0000000101929679 in gtk_spin_button_value_changed ()
#8 0x0000000103379e0d in g_closure_invoke ()
#9 0x000000010338c7b8 in signal_emit_unlocked_R ()
#10 0x000000010338d7a2 in g_signal_emit_valist ()
#11 0x000000010338db12 in g_signal_emit ()
#12 0x00000001017c0c66 in gtk_adjustment_value_changed ()
#13 0x000000010064f9b1 in Inkscape::UI::Widget::SelectedStyle::SelectedStyle ()
#14 0x0000000100384a78 in SPDesktopWidget::init ()
#15 0x000000010338f296 in g_type_create_instance ()
#16 0x000000010337fc1d in g_object_new_internal ()
#17 0x000000010337f3cc in g_object_newv ()
#18 0x000000010337f191 in g_object_new ()
#19 0x0000000100388671 in SPDesktopWidget::createInstance ()
#20 0x00000001003885ab in sp_desktop_widget_new ()
#21 0x000000010004bab3 in sp_file_new ()
#22 0x000000010004be11 in sp_file_new_default ()
#23 0x00000001000028f4 in sp_main_gui ()
#24 0x0000000100001ca4 in start ()