I think it is very EASY to miss the gallery button when you are first using Auctiva and don't know to look for it. The button I am referring to is when you go into your listing on Auctiva, scroll down to where you choose a template and counter. Right below that is a box that says, "Marketing tools" and here is where you would use the tab to choose Gallery. YOU KNOW WHAT, I was just looking again at it and I think you have to set up the Gallery - Marketing Tools under the Profiles tab at the top of your Auctiva page. I am sure you have noticed that Auctiva is based on setting up different profiles and then choosing from them. Well, this is no different. SO, first go to the Profiles tab on your Auctiva page, go under Marketing Tools and set up a Gallery Marketing TOol. THEN when you go into your listing you can choose Gallery in your Marketing Tools section.
Really, Auctiva is a great site....just takes some work to figure out the quirks and set up all those profiles!! Hope this helps!
Marcia