Consistent failure adding more than 500 items at once, steps to reproduce:
1) Fill a SDB with a lot of something, say 12,000 planks or 15,000 meat.
2) Gather a lot more of that item.
3) Drag the item (planks or meat or whatever) to the SDB.
4) in the deposit how much dialog, type all but a few (say 570 when you have 576)
5) the SDB will complain it couldn't deposit that much, take *all* of that resource in your bags, and only deposit some (usually about 5%-10% dissappears).