Soekris 1021 build need help

I just completed my 1021 build and I'am having a locks fast and solid to my cd player spdif dig out but it won't lock with my window's based pc server. All other dac's I've used commercial or diy have always locked to the server without issue. Lost :confused:

My set up
Windows 7 pc server with Spdif directly off motherboard
Soekris 1021 using diy spdif interface from user's manual
No preamp direct to amp
J River

cd player locks fast and and dac works perfectly