It's not intuitive, but as with Pulldown prepopulation, you need to add an autoRun="True" attribute to the top module in the view. In this case to the URLLoader module.
That will cause an initial push when the page loads and it's only when that push happens that the prepopulation will happen.
Note that of course the autoRun push will also dispatch all the searches on the page. If you dont want that to happen you can explore using a Button module with its allowAutoSubmit param set to False, to prevent this.
Back to the weirdness of autoRun being required here - With a Pulldown module it's maybe a bit more forgivable, because the autoRun is often also necessary to kick off the Pulldown's search. With TextField it's just weird I admit. The good news is that I think it's fixable with TextField so I'll take a look. Specifically I think in a near-future version I can correct this behavior and get your TextField's prepopulating without the need for you to add an autoRun="True".
Also, that other question was indeed answered if you read the comment thread he had a couple other typos and issues going on, but we got him sorted in the end.
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