If you are comfortable, please provide the following - if not, go to 'TRY THIS' below
1) who is your host?
2) What version of WordPress?
3) What version of Atahualpa are you coming from or is this a new install?
4) install the 'wp-securityscan' plugin (http://wordpress.org/extend/plugins/wp-security-scan/), activate it, go to the SECURITY option and on the right hand side is your site info, copy that and past it into a reply
5) go to phpMyAdmin and access your database and issue the following SQL statement
HTML Code:
SELECT * FROM `wp_options` WHERE option_name REGEXP '^bfa_ata'
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* TRY THIS *
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go to ATO->Style & edit CENTER COLUMN and hit the green SAVE button and see if that makes it work, if it doesn't, select everything in 'The LOOP' do a CUT, hit the green SAVE, paste it back in and hit SAVE again and see if that works.
If it does, go thru all the Atahualpa option pages and hit the green SAVE to make sure it picks up all teh options.