My listings have disappeared after applying your design

When you amend a listing, by apply design or any revision, eBay has a small delay while it re-indexes the information your have changed and puts it back on eBay. This is true of any revision and not just design.

Depending on eBay, this re-indexing, can take a few minutes to a few hours. During the re-indexing the item is still available on eBay and can be purchased by any buyer, but may not be available within a store view or search for a short time.