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I also have this problem. I switched wireless router from a Netgear to an Airport Extreme and now I can't set any favourites. When I tap 'Favourites' I get the 'Tap edit to add favourites' screen. When I tap '+' on the next screen I get the error message 'Failed to get available channels'. I've reset my Slingbox Solo, reset my Airport Extreme, uninstalled and reinstalled the iPhone App a number of times - but nothing has worked. I can't set favourites. This is a real inconvenience as to get to a channel I want I need to go through the various channels (or in the unlkely event I've memorised the channel number enter it via the remote, whereas previously I could go to my favourites and just tap the channel icon. Could this be an issue with the Slingbox or how can I fix it ?
UPDATE: I also have the iPad App and have the same problem on that - 'Failed to get available channels'.
UPDATE: I reinstalled the Netgear router and re-set everything - same problem, no favourites.