There was a trick that you could use to fix it that was discovered early in the new store… 12 items would be perfect for it.
Go to some page like http://www.daz3d.com/shop/sales-promotions/ which has ‘Last Added Items’ on the lower right of the page. There’s an (x) mark next to each item of the last 3 you added. Open each new item in a new tab (to save it) and then click the (x) to remove it from your wishlist. At some point your wishlist should start working again. Then you can go back and add each item (because they’re in tabs now) to your wishlist until it breaks again.
Right now, for example, I know that the Delorean (Gull Wing Lite) is blowing up, and probably breaks wishlists if it’s in them. Early on, and the reason I know this trick, is because Crazy Nights was having the same problem.
Anyhow, give it a try. Use the ‘Last Added Items’ to save and empty out your wishlist, and then re-add until it breaks again.