Mark,If you have phpMyAdmin, try this. Find your row in the phpbb_users table and null the user_smartfeed_key column. Then rerun smartfeed_url.php and see if it goes away.
Thank-you for the quick reply.
I nulled the user_smart_key column for my user id, and everything seems fine again.
If you have the time, I'm curious as to why this happened, after a week. Do I have to worry about it happening again? After the change, the new url that is generated is: