I use two addons a lot. FAStance http://www.armaholic.com/page.php?id=19017
and
ShackTac Fireteam HUD http://www.armaholic.com/page.php?id=18949
Sometimes they don't work when I load a mission in multiplayer LAN, where I play singleplayer missions. After I am killed in the mission and respawn they will usually start working.
BTW, I think FA Stance should be a feature of the game that BIS supplies. It is very difficult to keep track of what stance you are in without it. In real life this is never the case.