I cleared the settings, it didn't help.
I suppose it could be the cable, it's not a direct cable, but two digital cables one side connected to the Lynx AES16e and then XLR <-> XLR and then into the AES 11-18 port on the Eventide. I had to do it like this, I couldn't find a Tascam AES to Yamaha AES. I'm going to see if I can find one online.
I'm going to shorten the cable (these two cables are about 5 meters combined) and make it a single one this weekend, hopefully it'll resolve this.