Hello hippophile -
Auctiva hosted images have been made HTTPS for quite a while now to comply with eBay's recent policy change - so it sounds like we'd need to take look at some specific listings to see what you're running into - we've updated our links and images to use HTTPS so any newly posted listing will comply with eBay's policies.
Please file a support case with the details of what you're running into and a few item numbers where this is occurring and our support team will be happy to take a look into it.
- Craig