hi JohnnyWorker,
I just reviewed your account and found that your recent posting attempts have been rejected by eBay, and that an API error was returned in response. I created a saved listing within your account entitled "Auctiva Support - Interpretation of API Error" and, if view the preview of this listing, you will find the exact error message that was returned by eBay, which should point you in the right direction.
Any additional questions or concerns? Please file a support request using the appropriate link on our help page: http://www.auctiva.com/free-auction-software-help/help.aspx
-Mike