Hello all! We are aware of an issue where sellers listings disappear from their Listing screen. The item still appears in the marketplace if it was “On Sale” and can be purchased however it is not visible in the seller’s Listing screen.
We are working on fixing this problem as quickly as we can and will update this thread when we have more news.
Thank you and we apologize for the inconvenience.
10/27/2016 UPDATE: This issue has been fixed.