It seems like the best thing to do is check each time to see if something really posted, though I admit that it is a nightmare and very time consuming to do one at a time. I know you said you can't do your listings via a schedule, but what if you just batched them in small lots of say 5-10 at a time and posted those, wait a couple of minutes and check to see if they all posted. I've not hit that problem maybe because of the thing on the scheduling page that says they will retry for 30 minutes to repost the items if they can't post. If that is so, then hand posting against a computer taking everyones listings (especially on free days) and retrying them until they post is like trying to break through a brick wall by running into it. I would think more people than you are having this problem.