This happened to me when I won a bid for an Untamed Hatching. When I picked up from the mailbox and tried to learn it I got an Internal Error. I submitted a ticket and 11 hours later I got a funny letter from a helpful GM and my pet. My advice, submit a ticket, be nice in your letter to CS and you s...

I usually have seen them in the early morning. I'm on the east coast and play on a west coast server. I'd say maybe 5-6 am server time. Good luck!!