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The XML data needs to have the <?xml .....> processing instruction as the very first thing, no spaces, no line feeds, to be recognized as XML by the browser. This happens before the xml reaches YUI and depends on the XML parser built-into the browser.

Also, it is not a good idea to render a datatable into a hidden container, it will often get the columns aligned wrong. You can call the onShow method to fix it or show the panel before rendering the table.

Your XML and your responseSchema looks good to me, I can't imagine what might be going wrong.

You are correct, sorry, if it wasn't XML at all it would give a Data Error message.
The parseXMLData method uses getElementsByTagName to locate the records using the value passed in responseSchema.resultNode as its argument. If it cannot find any elements tagged <record> I believe it would return an empty array (actually a NodeList) but still an array so it would simply assume there are no record instances, not a data error.

So, I'm afraid I can't help you much unless you can place a working copy in some public place so I can run it with the debugger and see what's going on.

As for the last question, the scrolling datatable actually uses two HTML tables, one contains the headers and the other the data. To align the headers in one table with the columns in the other, it needs to actually read the widths of the columns to make the sizes of both match. Some browsers do not report size or position of elements not visible so DataTable cannot align the columns. If you show a table contained in a hidden container, the columns might be all misaligned with their headers.

Solved everything now - I had an additional error in the XML plus
did not set up the path to the datatable CSS correctly.

Now I need to get this working with pagination as I may have several hundred rows, which
takes waaaaaaay too long to GET from the server - let alone the rendering in the browser...