Fix thread switch

src/main/java/com/volmit/iris/core/gui/VisionGUI.java

@@ -168,14 +168,13 @@ public class VisionGUI extends JPanel implements MouseWheelListener, KeyListener
                 try
                 {
                     engine = IrisWorlds.access(world.realWorld()).getCompound().getEngine(index);
+                    return !engine.isClosed();
                 }
 
                 catch(Throwable e)
                 {
-                    engine = IrisWorlds.access(world.realWorld()).getCompound().getDefaultEngine();
-                }
 
-                return true;
+                }
             }
         }
 

src/main/java/com/volmit/iris/engine/framework/EngineTarget.java

@@ -55,7 +55,7 @@ public class EngineTarget {
     }
 
     public void close() {
-        parallaxBurster.shutdownAndAwait();
+        parallaxBurster.shutdownLater();
-        burster.shutdownAndAwait();
+        burster.shutdownLater();
     }
 }

src/main/java/com/volmit/iris/engine/parallel/MultiBurst.java

@@ -21,6 +21,7 @@ package com.volmit.iris.engine.parallel;
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.IrisSettings;
 import com.volmit.iris.util.collection.KList;
+import com.volmit.iris.util.scheduling.J;
 
 import java.util.concurrent.*;
 
@@ -96,6 +97,10 @@ public class MultiBurst {
         service.shutdown();
     }
 
+    public void shutdownLater() {
+        J.a(service::shutdown, 100);
+    }
+
     public void shutdownAndAwait() {
         service.shutdown();