If you mean the Battle Planner, you have to go to the "Options" menu from the Main menu, then, under the "Game" tab turn on the Battle Planner. Had me confused for a bit too.
I think we're talking about the same problem as in TYW: alternate stance buttons don't work. Only the old way "click on the actual stance - click on the new stance" does.
The alternate button bug, aye... that did the trick, I switched it off and now I can change the stances for the stack(s) as in defensive, offensive, etc. postures.