apps/examples/pwfb/pwfb_main.c:  Temporarily work around a race condition by adding a delay.
@@ -396,6 +396,17 @@ static bool pwfb_configure_window(FAR struct pwfb_state_s *st, int wndx,
goto errout_with_hwnd;
}
+ /* There is a race condition which we resole by simply waiting a bit here:
+ * In order for the size and position to take effect, a command is sent to
+ * server which responds with an event. So we need to synchronize at this
+ * point, or the following fill will fail.
+ *
+ * REVISIT: Here a dumb wait is used. It be better to have a firm
+ * handshake to when the new size and position are in effect.
+ */
+
+ usleep(500 * 1000);
+
/* Create a bounding box. This is actually too large because it does not
* account for the boarder widths. However, NX should clip the fill to
* stay within the frame.
