As stated in the Auctiva FAQs, the listings are pulled (disappear) to add the Scrolling Gallery as a migration aid to Auctiva's Services. They will be checked by eBay for security and policy violations, and will show again soon. However, the six hour usual time stated in the FAQ is alot longer during peak periods, like weekends. It's nothing Auctiva is doing in holding them back. It's eBay wait time, and there is absolutely nothing that can be done about that situation.
Danno