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Leon BigEars A&H

If sync master isn’t the problem, it might be worth you taking a close up photo of the ADAT connectors on your MMO card and send the photo into support at American Music and Sound (US A&H distributor) or via your rep.
There was a batch of ADAT optical devices that had changed spec by the manufacturer and caused glitches etc.

please do not adjust your set; normal service will be resumed as soon as possible!