diff -ur xine-ui/src/xitk/main.c xine-ui-new/src/xitk/main.c
--- xine-ui/src/xitk/main.c	Sat Aug  3 18:34:40 2002
+++ xine-ui-new/src/xitk/main.c	Sat Aug 17 18:37:29 2002
@@ -368,6 +368,8 @@
 
   vis.dest_size_cb      = video_window_dest_size_cb;
   vis.frame_output_cb   = video_window_frame_output_cb;
+  vis.lock_display_cb   = NULL;
+  vis.unlock_display_cb = NULL;
   vis.user_data         = NULL;
   
   /*