Oh, SNAP!
Just got back from Verizon and now there are a bunch of people with cracks too?
I sure hope this isn't some manufacturing defect! It's not the seem from the molding process, its a crack! You can feel it and it's not straight.
Within the first 14 days you can exchange the phone for another brand new one if you find any defects or problems. After that you will be covered under the 1yr. warranty and any subsequent coverage you opt for. However, the phone will be replaced with a certified like new device, unless they don't have any, at which point they will send you a new one.
Verizon did the exchange paperwork, gave me a receipt and ordered the NEW replacement. They will be calling me on Thursday to swap it out when is gets to the store. They were sold out and said the other local store also was. They would not simply ship me the NEW phone(which would have been convenient) because it's within the first 14 days.
If this turns out to be a common problem with the TB, HTC is going to make a new production run fixing the problem and provide a NEW replacement to everybody.