Three fixes;

- On file reading, a check is added to see if a Pose has channels to
  missing bones. Poses are supposed to match an Armature completely.
  (Thanks for crash file, Johnny!... but how did you do it!)

- Own collection: added depsgraph update on setting all layers (with the
  ACCENTGRAVEKEY). This also could potentially crash with modifiers

- Renamed Xkey menu in NLA to more properly tell what it does. :)

source/blender/blenloader/intern/readfile.c

@@ -1379,6 +1379,7 @@ static void lib_link_pose(FileData *fd, Object *ob, bPose *pose)
 {
 	bPoseChannel *pchan;
 	bArmature *arm= ob->data;
+	int rebuild= 0;
 	if (!pose)
 		return;
 
@@ -1386,6 +1387,12 @@ static void lib_link_pose(FileData *fd, Object *ob, bPose *pose)
 		lib_link_constraints(fd, (ID *)ob, &pchan->constraints);
 		// hurms... loop in a loop, but yah... later... (ton)
 		pchan->bone= get_named_bone(arm, pchan->name);
+		if(pchan->bone==NULL)
+			rebuild= 1;
+	}
+	if(rebuild) {
+		ob->recalc= OB_RECALC;
+		pose->flag |= POSE_RECALC;
 	}
 }
 

source/blender/src/editnla.c

@@ -1168,7 +1168,7 @@ void delete_nlachannel_keys(void)
 	bConstraintChannel *conchan;
 	bActionStrip *strip, *nextstrip;
 	
-	if (!okee("Erase selected keys"))
+	if (!okee("Erase selected strips and/or keys"))
 		return;
 	
 	for (base = G.scene->base.first; base; base=base->next){

source/blender/src/header_view3d.c

@@ -157,6 +157,9 @@ void do_layer_buttons(short event)
 		
 		if(G.vd->scenelock) handle_view3d_lock();
 		scrarea_queue_winredraw(curarea);
+		
+		/* new layers might need unflushed events events */
+		DAG_scene_update_flags(G.scene, G.vd->lay);	// tags all that moves and flushes
 	}
 	else {
 		if(G.qual & LR_ALTKEY) {