Linda:
Are you using the Beta version of AW2K? If you are, it is my understanding, that the listing form you are using shouldn't matter. There may be other problems with what you are trying to relist. I don't mean you haven't done something correctly but I have found that sometimes when a relist doesn't work that if I put in $0.00 for Additional Item Ship charge that will let the item list.

If you are using the Non-Beta version of AW2K I would check to see that the duration has been set properly if you have gone from auction to store format or that the old duration isn't still in there under store format. As you know there are now only two choices 30 or GTC.

None of this may help and I wish I could offer other advice. Have you tried relisting just one item so that you can be taken to the eBay page to find out what it thinks is the problem? That often works - just list one item rather than a multiple listing and see what transpires when the software asks you if you want to see the eBay error page.

Garry