Hi Daniel,
I think I've given this the best shot I have.
1. I uninstalled the application, then reinstalled, made no modifications whatsoever. It didn't work.
2. I enabled/disabled as many things as I could (using captcha or not, mod approved or not, etc.), one by one to see if that helped. It didn't work.
I'm still getting (with captcha being off):
<?xml version="1.0" standalone="yes"?><post><id></id><published></published><noerror>1</noerror><debug></debug></post>
Also, in the EMAIL textfield, it says "AUTOMATIC" and it cannot be removed.