I would still strongly suspect the "client has focus in a part of the interface which prevents the drone hotkey from being acted upon" issue that I referred to in http://www.dual-boxing.com/threads/5...l=1#post395521

If you manually go to each client and click in space and then issue the drone recall command, do they all recall?

What you describe sounds exactly like the issues I had when 5 boxing with drones... I just got used to broadcasting a click in space before recalling but you don't have that luxury now.

IMHO, the hotkey not being recognised at all times is a bug but good luck getting it sorted