I had the same problem, the iPad I had used in testing worked fine, and an iPhone worked fine, but when I went to connect another one, it would crash out as soon as I went to connect it to the DL32R.
Called Mackie Support, and they said it sounded like a firmware glitch and to force a reload of the firmware (you know, press the reset button while booting up, and when it upgrade mode, start the upload from the iPad).
After doing that, all is well again in the world.
There is something to the fact that saving shows on one iPad affects others when they start up and load the show now. It's like something in the new transport isn't streaming right.
In my tests, this has been done with iPad's with latest IOS and on an Airport Express with very low noise floor - full strength signals.