So, I bought a brand new XR18 Air. Downloaded the app to my iPad Mini. That worked. Got myself an iPad 3rd gen. (Yes an oId one) and downloaded the app. That worked too. Yesterday - Same problem that you have. - iPad 3rd gen won't work. Never mind, the mini still works. Ooo look - an update. Updated it. Now the mini doesn't work either. It's the update that has fouled things up I guess. I can't find an earlier version than 1.5 Will Behringer help? I'll have to take my laptop to gigs instead.