Possibly. I'd like a confirmation. My group's tanks were having trouble clicking at the beginning.. Sometimes it worked sometimes it didn't.. I think.. But then we realized one of our tanks was just bad
You mean where one of the crystals isn't clickable to one (or both) of the tanks?
My MT couldn't click the crystal that gave him the barrier ability. It seems to be a bug with -everything- in the game, where for some reason, a mob or quest item becomes unclickable to you.