I'm running 9.3.5 on the iPad so that isn't the issue. I do suspect, like you do, that the USB connector being the old 30-pin and not the lightning connector might be the issue. I don't have access to a new iPad with that so I don't have a way of checking that out.
Using Spider Remote on my phone works well and is easy to use, maybe I'll just stick with that. If I'm out playing with some friends it only means I have one less piece of gear to take along.
Thanks for the reply!