Regarding this error:
user warning: Unknown column 'address1' in 'field list' query: SELECT first_name, last_name, company, address1 AS street1, address2 AS street2, city, zone, postal_code, country FROM uc_quote_product_locations  WHERE nid = 72 in /../includes/database.mysql.inc on line 172.

I added the columns to the table and it stopped giving me an error. I hope this wasn't a solution that will cause me other problems down the line!

I'm still having the XML error, though.