diff --git a/keyboard.xml b/keyboard.xml
index c2c3d3e28..53d8b2905 100644
--- a/keyboard.xml
+++ b/keyboard.xml
@@ -1123,10 +1123,22 @@ top down before the key bindings are parsed.
    <script>
      var success = fgcommand("screen-capture");
      var path = getprop("/sim/paths/screenshot-last");
-     if (success)
-         gui.popupTip("Screenshot written to '" ~ path ~ "'");
-     else
-         gui.popupTip("Error writing screenshot '" ~ path ~ "'");
+     var threading = getprop("/sim/rendering/multithreading-mode");
+     var message = "";
+     if ( threading != nil and threading != "" and
+          threading != "SingleThreaded" )
+    {
+         message = "Threading model must be SingleThreaded (or not defined) for snapshots to work.";
+         gui.popupTip(message, 600, { button: { legend: "Ok", default: 1, binding: { command: "dialog-close" }}});
+     } else {
+         if (success) {
+             message = "Screenshot written to '" ~ path ~ "'";
+             gui.popupTip(message, 2);
+         } else {
+             message = "Error writing screenshot '" ~ path ~ "'";
+             gui.popupTip(message, 600, { button: { legend: "Ok", default: 1, binding: { command: "dialog-close" }}});
+         }
+     }
    </script>
   </binding>
   <mod-shift>