Sound suddenly missing

I use my III as my audio interface with my imac running Mojave. I recently updated to 1.19 and started having intermentant problems with my sound(from iTunes, VLC, etc.) cutting out I reverted to 1.18 with the same results so I don't think it's the firmware? Now, today I can't get any sound from the iMac. Sound preferences says "the selected device has no output controls" I've tried restarting the III and the iMac several times and still no sound?
 
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