items not hauled to Trade Depot

So, the Dwarf traders have arrived. The day that they showed up, I immediately told everyone to start moving goods to the Depot.

• q on Trade Depot
• g move goods

and told my broker to haul his ass over too.

• q on Trade Depot
• r request trader at depot

By the time the broker finally decided to show up, I found out to my surprise, that no-one could be bothered to haul items to the trade depot, even though hauling to the Trade Depot jobs have a high priority (right?). They were all going about their business: attending meetings, watching sparring demos, eating, sleeping, doing their job (for a change), dumping, moving items to stockpiles, ...

I have no idea what is going on. The Trade Depot is accessible. When I start trading, stuff from last year is available for selling. The rest is still [PENDING]. No mandates are impeding trade, stockpiles are giving away like hippies elves, no burrows active, no forbidden items (couldn't have marked them for trade anyway, I think)..

How is my leadership lacking? Is the dwarves' passive-aggressive ignoring me an early sign of a mutiny about to happen?