ApeMatrix not receiving; AB3 giving me a hard time
I'm new to iOS music, trying to get my new iOS setup to work. I'm not new to computer music and complex audio processing hardware, but this is the first time I've tried to integrate an iPad into my music. I've read all manuals and learned how to use AB3, AUM, ApeMatrix and I have iConnect Audio4+ working nicely as my I/O.
Now I'm at the totally confused, overwhelmed, nothing-works-like-the-tutorials stage. I need help.
First mystery: I can't get the top row of receiving apps in ApeMatrix to work--I get that Do Not Enter symbol (circle with slash). Screenshot:
I'm probably missing something really simple. I've tried everything I can think of, including looking in each of the apps for where I might need to open a port or something. All the apps work fine in stand-alone mode.
AB3 isn't cooperating either. I get lots of ZZZzzz's and apps refusing to load. Sometimes it works, sometimes it doesn't. That might be a separate issue, but I mention it in case it's somehow related.
What should I try or fix or change?
Using a new iPad 6, and all software versions up to date.