diff --git a/PanoPainter/GameViewController.m b/PanoPainter/GameViewController.m
index 08f02af..346d8c4 100644
--- a/PanoPainter/GameViewController.m
+++ b/PanoPainter/GameViewController.m
@@ -417,10 +417,14 @@ std::set<UITouch*> ignored_touch;
         working_list = std::move(tasklist);
     }
 
-    if (!(App::I.redraw || App::I.animate || !working_list.empty()))
-        return;
-
     [self async_lock];
+    if (!(App::I.redraw || App::I.animate || !working_list.empty()))
+    {
+        [self.context presentRenderbuffer:GL_FRAMEBUFFER];
+        [self async_unlock];
+        return;
+    }
+
     while (!working_list.empty())
     {
         working_list.front()();