1- You have everything updated
2- You are certain you have the MIDI set to USB
Just a quick note, the iPad and Multi12 do not function bi-directionally, meaning any changes you make on the iPad, you have to then send those into the Multi 12 using the arrow in and arrow out graphics on the bottom right hand side of the App screen.
Also make sure you have a functional USB Chord connected to a camera connection kit.
The video below describes the steps involved with getting the App to work with the M12 unit.
Keep me posted Patrick!