Word Clock Lock Error

[TBell930]

Hello everyone. I'm new to forum, so I'm not sure if this has been addressed here before.if so, please refer me to a link. Thank you in advance. I'm having trouble receiving ADAT from Pro Tools to my Tape 1-8 returns. Also, I have all word clock out and in devices routed properly, but the d8b will not recognize any word clock coming in. Actually, I'm getting a Lock Error anytime that I change sample rate and also anytime that I switch from Internal to Word Clock. The board only locks with 48kHz and Internal setting. What could possibly be the problem? Bad Apogee Word Clock?