This isn't a new thing -- I've had trouble getting potions to quaff since I started playing. It seems that any time I'm doing anything except standing still, possibly even any time I'm sustaining damage, the Q button just doesn't respond. It makes a sound as though it's responding, and I often think it has, but it's done nothing. Is this something I'm doing, or has someone made an addon to properly queue your potion use for when it can be used, so I won't have to spam the button and hope I hit it at the right time?