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It is absolutely reasonable to feel cheated my friend and I feel your pain.   The problem with it being something that was easily fixed before the sale is that it wasn't an issue that needed fixing until the sale. It either got overlooked or wasn't thought about. And in actual fact I don't think the back button was much of an issue anyway. I know plenty of people that tried it and every one was kicked out. There were other ways the system was exploited of course but no system is going to be perfect.   As an aside, out of our 6 groups that got tickets, 4 of them got in using a single device. The standard low tech ticket buyer is far from excluded.

RELAX    

Not sure if it knocks off (pun absolutely intended) the new Knocked Loose record for me in terms of heavy releases, but it's absolutely outstanding!   "the center's falling out" in particular had me pulling all kinds of nasty faces. So heavy.

My Chemical Romance is the speculation 

Noted, let's see what materialises.