Welcome to the answer forums. I am not sure what device you have but guessing from what you have stated about the new update I would say the iPad. To look at the streaming rate and what type of streaming that your box is outputting you would want to tap on the screen with 3 fingers. To get the best connection you would want it to say it was streaming in TCP with at least 1000KBPS for SD and 2000KBPS for HD.
Hope this helps,
Sling Moderation Team