diff --git a/SilicaViewer/ViewController.swift b/SilicaViewer/ViewController.swift
index e0f3f07..1f90ae9 100644
--- a/SilicaViewer/ViewController.swift
+++ b/SilicaViewer/ViewController.swift
@@ -7,7 +7,15 @@ class ViewController: NSViewController {
     override func viewWillAppear() {
         let document = self.view.window?.windowController?.document as? Document
         
-        imageView.image = document?.makeComposite()
+        DispatchQueue.main.async {
+            let image = document?.makeComposite()
+            
+            //DispatchQueue.main.sync {
+                self.imageView.image = image
+            //}
+        }
+        
+        
     }
     
     override func prepare(for segue: NSStoryboardSegue, sender: Any?) {