Thanks for your help, the problem has been solved. I emailed Thom Withgott earlier and here is the reply.


eBay is probably using the new version of the Sell Your Item page to list
your items. AW2000 does not work with the new version of the Sell Your
Item page. Use your web browser to sign into the eBay website, then click
the "Sell" button at the top of the page. On the sell page there should be
an option at the top for switching back to the old version of the Sell
Your Item page. If that option appears, click on it. Sign out and try
listing your Auction Lots in AW2000 and see if that solves the problem.