I sure hope that the experts can help me, this one has me thoroughly confused.
I was messing with a project in LPX 10.4, and I noticed that my Arturia 32 note controller (which is plugged directly into my iMac) was not working. If I used the onscreen keyboard I got output, but nothing when I pressed the keys on the Arturia. I opened up MIDI Monitor and noticed that none of my USB controllers were listed.
I next checked Audio/MIDI Setup, and while my USB controllers were there, they were all grayed out. I hit the Rescan button, no change. So I made a new configuration named "Test", all my USB keyboards showed up, nothing was grayed out! I re-opened MIDI Monitor and they were all listed there as well. However, nothing registered in MIDI Monitor when I pressed the keys on any of my controllers.
I went back to Audio/MIDI Setup and clicked back on my default configuration. No change. I clicked on my test configuration and all of my USB controllers were grayed out again. I hit Rescan, no change. Created a Test2 config and everything was there. But if I go back to any prior configuration, it messes up the newest configuration. And of course there is no output when I try to use any of these controllers. So I created Test3 and that's where it sits right now. Everything shows up, nothing is grayed out... and nothing works.
Any thoughts / ideas / suggestions?
Late 2012 27" iMac, 3.4 GHz i7 processor, 24 GB 1600 MHz DDR3, running Sierra 10.12.6