Topic: ADI-8DS: can't get sync with E-MU 1212m. Compatibility problem?

Does anyone know of any reason why an E-MU 1212m won't lock to RME products via litepipe? I've tried to lock the 1212m to an ADI-8DS and a Hammerfall. No go. The RME devices are definitely fine and will lock with each other, both ways, but the 1212m will not accept external sync from either of them. I'm stumped. Is there a possible incompatibility there that I'm unaware of??

I've posted this on the e-mu forum first and haven't found a reason for it yet, so thought I would ask here...