BrianFreud
Lore Keeper, Wiki Maker, & Doer of Crazy Things
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I seem to keep running into this one. I finally figured out the cause when a search result led back to my own house, and I could see the vendor sitting in the moving crate. Vendors who are in there are still being indexed, and are creating functioning maps to the house - but which then do nothing (don't open the vendor) when you pay and arrive.