XML displays in window before loading.

I have just converted my script from JSON to XML and a curious thing happens. Before the grid is loaded, a popup window comes up that displays the generated XML. It says:

Loading: …/resources/connector.php?qid=6
Status: 200
Response: <?xml version="1.0"?>

and so on displaying all the XML file.

Why?

It seems you have included dhtmlxcommon_debug.js file to your page

You are right; how silly of me!