Are you talking about the Chicago show?
I think they got hacked by a broker with a computer system that swooped in and took at the tickets. This happens a lot, especially in presales like this. Or their system is just broken.
I literally hit refresh on my browser until the split second (10am exactly) the tickets were supposed to be on sale and then I selected 2 tix and hit "add to cart" within a millisecond. Yet I still could not get any tickets. Then I tried to quickly buy 1 ticket, then change my seating section, etc. Nothing.
Hopefully they will see people complain and realize there is a problem. It's so frustrating! :(