01-12-2013 12:20 PM - edited 01-12-2013 12:25 PM
Do you use IE as your browser? There's been a problem with IE since the last update.
Try the solution in this thread
http://community.ebay.com.au/t5/Selling/Whats-happened-to-the-create-your-listing-page/m-p/822385#M4...
Or switch to using Firefox or Chrome