v0.7.2: even more bugfixes:

- fixed rankings windows being able to be stacked (caused crashes)
- fixed visual bugs caused by stacked teleportation effects
- fixed darts being counted as melee weapons for swift enchant

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/scrolls/ScrollOfTeleportation.java

@@ -211,7 +211,7 @@ public class ScrollOfTeleportation extends Scroll {
 		ch.sprite.interruptMotion();
 
 		ch.move( pos );
-		ch.sprite.place( pos );
+		if (ch.pos == pos) ch.sprite.place( pos );
 
 		if (ch.invisible == 0) {
 			ch.sprite.alpha( 0 );

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/weapon/missiles/darts/Dart.java

@@ -83,7 +83,9 @@ public class Dart extends MissileWeapon {
 	@Override
 	public int proc(Char attacker, Char defender, int damage) {
 		if (bow != null && bow.enchantment != null && attacker.buff(MagicImmune.class) == null){
-			damage = bow.enchantment.proc(bow, attacker, defender, damage);
+			level(bow.level());
+			damage = bow.enchantment.proc(this, attacker, defender, damage);
+			level(0);
 		}
 		return super.proc(attacker, defender, damage);
 	}

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/windows/WndRanking.java

@@ -52,7 +52,7 @@ public class WndRanking extends WndTabbed {
 	private static final int WIDTH			= 115;
 	private static final int HEIGHT			= 144;
 	
-	private Thread thread;
+	private static Thread thread;
 	private String error = null;
 	
 	private Image busy;
@@ -62,6 +62,11 @@ public class WndRanking extends WndTabbed {
 		super();
 		resize( WIDTH, HEIGHT );
 		
+		if (thread != null){
+			hide();
+			return;
+		}
+		
 		thread = new Thread() {
 			@Override
 			public void run() {