Go to the Atahualpa Theme Options main, top setep area. It's not the START link but the one below it. It will be something like Export/Import Settings. Then scroll down to where you see "Delete the option 'bfa_ata4' " and click to delete it. This says, "Since 3.4.7 options are stored in one single option named bfa_ata4. If you had issues with Atahulpa 3.4.7, 3.4.8 or 3.4.9 you may have a corrupted option bfa_ata4 in the database." and that will fix it.
Well, worked for me when I upgraded to 3.4.9 - and I just did it again when upgrading to 3.5.2 and it fixed it...