Their is a much more detailed description of how I got there at http://drupal.org/node/786444

But the bottom line is I added Simplenews On Register and now I have two "Subscribe" checkboxes for the same newsletter. The user registration form has also started printing out the word "array" before these boxes. See attached screenshot. I would disable this, but I read people have had trouble with new users seeing a white page suddenly.

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Picture 42.png38.13 KBmcfilms