Errors of this type, heck any type, are best approached by...Sign off of eBay, exit the browser, restart the browser. The above releases session cookies. You also need to clear the browser cache. Each browser has it's own method - Google "How to clear browser cache for (browser)"
Now, sign back on to eBay and retry the operation. If the issue still exists, sometimes all of the cookies for the browser need to be deleted. This can have drawbacks, as cookies can do some good things for you, but using a program like Ccleaner.exe (free, google it) will allow you to delete all cookies for your browser.
In some cases an issue is browser related, ie. the issue may only exist in a particular browser.. For that reason it is good to have at least a working relationship with an alternate browser. Then you can try the operation inj another browser.
The above steps are especially important, if you stay signed on all of the time. As eBay makes changes, your browser cache/cookies may not be refreshed with the latest chaanges.
eBay is continually updating this site. Some advice given may have changed. Please reply to this thread, to let us know if this advice works for you. The links on the bottom of any eBay page can help you deal with most eBay issues. Contact eBay Customer Service on Facebook.com/eBay or Twitter.com/AskeBay
