Or really, any place else that has you withdrawing stacks. You see, as it is, you have to separate a stack before withdrawing. But if all the spaces in that tab are full, there's no place to separate. And if you've a withdrawal limit in place, no one can withdraw anything from that stack because it exceeds the limit.
It would be really nice if I were prompted with "How many?" when trying to take items from a stack out of a bank tab.