NPC corpse locked out
 

A corpse became locked. "You cannot loot this because someone else is." or whatever, but no one was around. Hobby told me to post the bug here.

A player mentioned it has happened to him when someone was looting the corpse and went linkdead.

That was me... Generally, that is when it happens - if I'm actively looting a corpse and I crash, it's still locked when I come back.