I'm having an issue where Logic X won't work if Helix is the output device. And by not work, I mean no sound is transmitted and the meters don't even light up in Logic so it acts like no signal is being read. Trying to change to built in output while Helix was connected caused Logic to hang/freeze. I had to disconnect the Helix, relaunch Logic and change the output to the built in output and then Logic works just fine. Is anyone else experiencing this? Any work arounds?
Fwiw, I'm running a 2013 27" iMac , Helix fw 2.54, and 10.14 dp1.