On your computer, drag the game icon to the side that says Houston and you will get the Rockets announcers team. Also, there is a thingy on the NBA.com site where you plug in your zip code to find out if a team is blacked out to you. Like where I am in Honolulu I can't get the Clippers or the Lakers (hate both anyways) but I also can't get the Sacramento Kings.
I'm told it could last 3-5 days while whoever is working on this sorts out what's wrong with the blackout system. Of course nobody bothered to inform the customers and I highly doubt I was the first person to discover this issue. You would be entitled to a credit.
