Below is a response received from Auctiva. PERHAPS WE SHOULD keep on eBay and see if that solves the problem?! I will contact them with my 'experiments' and see what they say. (LOL)
("have you cleared your cache and cookies") Who wants to bet with me!
Posted Monday, 8/20/2012 8:24 AM
Thank you for contacting Auctiva support. We have fully investigated this issue with the help of eBay and have come to the conclusion that the issue is on eBay's end. EBay reports all items will have the zoom feature automatically if the images are at least 1000px on one side. Through our investigation we found we are submitting everything correctly for eBay to add that feature, just that eBay is not adding it for some reason. We recommend contacting eBay support in regards to this issue, as they will be quicker to resolve the issue due to customer reports.