In the middle of a free auction listing weekend for Private Sellers it looks like the eBay site has gone into meltdown. 100s of sellers are complaining that they can’t get into My eBay or Selling Manager.
Even if you can get into eBay My Messages you probably not be able to accept or decline any Best Offers that have been submitted. If you manage to get into SMP then none of your sold items will appear.
No doubt (hopefully) everything will be back to normal by Monday morning tomorrow, but in the mean time best advice is to take a few hours off and survey the carnage later once the site is back up and running.