"Gear" Action Problem

[doubleblind 13]

I'm using the following code to open up a subordinate unit's inventory and exchange gear between the unit and an ammobox:

_unit action ["Gear",ammoBox

The problem is, once the inventory dialog opens it only shows changes for maybe a second before refusing to show any more changes regardless of player actions. Oddly, when I walk over and open the inventory myself whatever gear I stored in the ammobox is there, the inventory dialog just doesn't show it. Anybody know what's up?

Thanks!