I'm running the latest version of iOS (version 6.1.3) on my iPad 2 and have the latest update of Line 6 Mobile POD (version 1.5.0, Audiobus compatible). Recently I've found that that the Mobile Pod app does not recognize my Sonic Port device, even when it is properly connected. I've followed the Sonic Port FAQ page suggestions and attempted resetting my iPad to factory settings and then restoring it to a previously saved restore point. I've made several attempts and used several previously saved restore points to get the app to work with the Sonic Port again, but all attempts have failed. I was able to be successful only once, about a month ago when I first got the Sonic Port. Now, the thing is worthless.
Unfortunate because the tones in Mobile POD are really good. But, if you can't use them, no one cares. Not sure how much effort Line 6 put into development of these products, but as I said, who cares now?
If anyone has a solution to this, please advise. And then I'd suggest selling your advice to Line 6!