The behind-the-scenes process of a stock trade is something that I've never cared about until recently, mostly because I had other things to think about. Clearing houses, order execution, and chills would have been interesting if I was studying to become a stockbroker, but I'm not. I'm an investor.
The Depositary Trading Corporation may have had a legitimate reason for taking the action that they took. They may have a good reason to lift their "chill" later. Ameritrade may need to require potential sellers to produce a paper stock certificate. If so, it would only be fair for them to offer to give every buyer a paper certificate whenever they allow purchases.
I'm working on many projects at the moment. Very few of them are appropriate for this board, and one of them is rather urgent, so I'll focus on that, if you don't mind.