Hi raresoul,
Thanks for letting us know about this. Based on the behavior you are describing, it sounds like eBay felt it necessary to "re-index" your listings to appear in the appropriate search results pages when the scrolling gallery was added to them. This is actually a fairly common occurrence and, according to eBay's help page on the subject, they should reappear within 6 hours.
Additional information on this fairly common eBay issue is available on the following page of eBay’s help index:
http://pages.ebay.com/help/find/questions/wheres-my-item.html. If you have any further questions about this specific issue, I recommend you contact eBay’s customer support department.
If you have any additional questions or concerns regarding your Auctiva account, please feel free to contact our customer support team using the web form on the following page:
http://www.auctiva.com/help/requesthelp.aspx-Mike