I've searched and searched, using every word on my heading, but at least two of my listings arn't showing up. Have I done something wrong or could it be an cBay problem? Thanks in advance.
Any chance they failed to list? Check the Events at top right on Auctiva main page and see if the listings were successful or failed with some error at submission.
If they did make it to ebay and show in your "My eBay" as active listings, they may simply be taking longer than usual to classify and index (weekends are the slowest).
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