In the plug-in 'Contest', deselecting 'Allow multiple votes per user' does not stop the user voting more than once on the same image. What it does is make only that users last vote count.
In my set of rather abstract images, the user could be forgiven for sitting there all day voting on the same images over and over again.

Does anyone know of a way to stop an image coming up for a user once it has been voted on by that user?

thanks