Thanks for posting to our Forums! The first thing I would like to advise is we are compatible with the New iOS 7, there maybe a few streaming issue but we are working on this as we speak. Also would like to mention that all iPad1's with iOS 5.1.1 are having an issue getting the SlingPlayer up and working, we are also aware of this issue and working on this fix for our customers running this setup with iPad1 and iOS 5.1.1
Sorry for the inconvenience!
The Sling Media Moderation Team