A lot of times when I have agro equipped in zombie mode it shows on the bar at the bottom of my screen as air strike. when I press 7 it still shows me the agro skull and it works like agro.
Also I had revive equipped and when I went to revive someone I clicked and clicked and clicked everywhere I could on them and it wouldn't work. This was at the beginning of the round and I can ensure you that it was not reloading.