I deleted the theme/atahualpa353/images/header folder and then recreated it.
Since having done this my images no longer rotate despite having set the theme options to do so.
I do get a new image every time I refresh but cannot get the rotating option to work with the timer (5) or any other number.
Any ideas? I downloaded the theme again and looked in the header folder to make sure there were no php files...which there aren't.