I have been playing my ranger for a while now, and I've noticed that the skill Armor Shredder does not always fire off. I have changed its placement in my skill map, tried a different device, and even removed the screen protector, and still doesn't always activate. It's so bad as to be almost useless, since I can't count on it working. Actually in surprised when it does go off. :-/

I am normally using an iPad2 with latest iOS, but I have also used iPhone 4, again with latest iOS, also with the same results. I'll try later with an android device.