You are not the only one having this issue. I ran into the same issue with the update the that killed both Dish World and Blockbuster apps on my Sling box 500. Pathetic customer support, I paid $250 for this device recently and this is the service I get.
I called the support at least 4 times and they ask me to contact Dish World for support. Finally they took my complaint and said we are aware of this issue and the developers are working on a resolution. I am paying $45 a month to Dish World and unable to enjoy for what I pay because of Sling box.
I'm very disappointed and what a waste of money for this device now.