I'm not sure why the support staff that are supposed to be working on Saturdays are not answering your cases. I will look into that.
We had some slowness on our servers tonight that caused listings to not post in time. Your listings should eventually give a message of "Not Posted" on the Scheduled Listings page with a link to "Reschedule Item".
We have been looking into this issue and are continuing to try and bring things back to normal. I'll post back when I have more information.