The program 'midori' received an X Window System error. This probably reflects a bug in the program. The error was 'BadPixmap (invalid Pixmap parameter)'. (Details: serial 15129 error_code 4 request_code 2 minor_code 0) (Note to programmers: normally, X errors are reported asynchronously; that is, you will receive the error a while after causing it. To debug your program, run it with the --sync command line option to change this behavior. You can then get a meaningful backtrace from your debugger if you break on the gdk_x_error() function.)

вот с таким сообщением стали вываливаться gtk'шные приложения при drag'n'dop'e после обновления иксов и гтк

PS: xorg-server-1.7.1 gtk-2.18.3