I love my Shure MV88 mic and the Motiv software. I did have one show where the entire second set had nice video and zero sound even though I'm pretty sure the audio levels were moving. I thought maybe the lightning connection was somehow loose. There is a lot of "play" on my mic where you can wiggle it back and forth.
At that same concert, a very nice guy who works high up at Shure gave me his card while I talked to him about how much I liked the mic... I am going to send him a note and also a link to this thread. Maybe my experience is more common than I had thought.
To in2blues... does the video play with sound on yr iPhone?