That's funny that they claim that the shares arrived just an hr ago when MHHC traded just fine over the past 2 days on Etrade. Definitely something fishy going on.
There is nothing "fishy" going on. When a company does a name/ticker change, or a split, new shares have to be exchanged for the old ones. That is the TA's job. It usually takes a few days.
But if any of the brokers wish, they can allow the stock to trade in the interim, with a special designation.