Nailed the IllegalAccessException (thanks to lechd).

src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java

@@ -434,45 +434,36 @@ public class BukkitWorld extends LocalWorld {
                 continue;
             }
             
-            switch (type) {
+            if (type == EntityType.ARROWS) {
-                case ARROWS:
                 if (ent instanceof Arrow) {
                     ent.remove();
                     num++;
                 }
-                    break;
+            } else if (type == EntityType.BOATS) {
-                case BOATS:
                 if (ent instanceof Boat) {
                     ent.remove();
                     num++;
                 }
-                    break;
+            } else if (type == EntityType.ITEMS) {
-                case ITEMS:
                 if (ent instanceof Item) {
                     ent.remove();
                     num++;
                 }
-                    break;
+            } else if (type == EntityType.MINECARTS) {
-                case MINECARTS:
                 if (ent instanceof Minecart) {
                     ent.remove();
                     num++;
                 }
-                    break;
+            } else if (type == EntityType.PAINTINGS) {
-                case PAINTINGS:
                 if (ent instanceof Painting) {
                     ent.remove();
                     num++;
                 }
-                    break;
+            } else if (type == EntityType.TNT) {
-                case TNT:
                 if (ent instanceof TNTPrimed) {
                     ent.remove();
                     num++;
                 }
-                    break;
-                default:
-                    continue;
             }
         }