fix for accessing invalid memory when loading a new file.

source/blender/blenkernel/intern/scene.c

@@ -249,7 +249,12 @@ void free_scene(Scene *sce)
 	/* do not free objects! */
 	
 	if(sce->gpd) {
+#if 0   // removed since this can be invalid memory when freeing everything
+        // since the grease pencil data is free'd before the scene.
+        // since grease pencil data is not (yet?), shared between objects
+        // its probably safe not to do this, some save and reload will free this.
 		sce->gpd->id.us--;
+#endif
 		sce->gpd= NULL;
 	}