We’ve seen a few reports of people experiencing errors whilst trying to list tonight (although sales appear unaffected). We’re currently running some background jobs to prune old data and improve site performance. We didn’t anticipate that these would affect users, but it appears that in some cases (such as listing) it has and some users may need to try submitting the problem page again if they receive an error page initially. These jobs will be finished before tomorrow morning, so any problems will be gone by then. Apologies to any sellers who have been affected by this.