http://svn.wxwidgets.org/viewvc/wx?view=rev&revision=46513 gtk_border_free is for freeing GtkBorder's, not g_free. Using g_free instead used to have no ill effects as gtk_border_free called that anyway, but in gtk+-2.11 GtkBorder uses GSlice and gtk_border_free therefore uses g_slice_free and using g_free makes things crash hard. So fix it or wxGTK won't work with the gtk+-2.12 stable release. Thanks to Keith Ritchie for pointing me to the patch. --- src/gtk/button.cpp 2007/06/18 05:53:03 46512 +++ src/gtk/button.cpp 2007/06/18 06:03:50 46513 @@ -71,7 +71,7 @@ right_border += default_border->right; top_border += default_border->top; bottom_border += default_border->bottom; - g_free( default_border ); + gtk_border_free( default_border ); } win->MoveWindow( win->m_x - top_border, --- src/gtk/window.cpp 2007/06/18 05:53:03 46512 +++ src/gtk/window.cpp 2007/06/18 06:03:50 46513 @@ -2738,7 +2738,7 @@ right_border += default_border->right; top_border += default_border->top; bottom_border += default_border->bottom; - g_free( default_border ); + gtk_border_free( default_border ); } }