same bug over the duration of the final boss fight in tam-tara deepcroft. i was playing on the marlboro server as an arcanist on a ps3 trying to use a lvl 2 limit break, i had it mapped to LB+up and nothing happened no area indicater appeared or anything, the icon on my action bar flashed to show that the button sequence was infact being pressed but otherwise you couldnt tell atleast not to any outside party members.