From what I hear, there's just some lag with the processing. A friend of mine had the same issue and got with customer service about it, and CS confirmed that there was just a bit of lag, and that it can take upwards of a few hours for your coins to show up. I guess just keep checking your Coin Ledger.
(Just bought some coins myself. Now the wait begins.)
Well, don't you just have the patience of Job. I'm sorry, but when it comes to paying cash for a service that is advertised as immediate, my patience flies out the window. This is sub par business.