ADAT Bridge/888 Clicks & Pops

[knewbee]

Just setting up a ProTools MixPlus system now, with an ADAT Bridge and a single 20-bit ADAT-XT. [Beige G3/266, 192 Meg RAM] I set up the MixPlus system first by itself and all is well. However, the ADAT Bridge isn't working. I get constant digital noise along with the source signal when I record enable tracks on the XT with a ProTools tracks as their source. I also get the same noise when I record enable tracks in Pro Tools with the ADAT bridge as their source.
I have a BRC and MTP II Midi interface, but for now I'm not worried about sync'd playback. I just want to use the ADAT for some extra I/O on my Mackie board.

Some details:
- It's a 24-bit/48K session in PT.
- 888/24 is Master interface on Mix Core card
- Sync set to Internal on 888
- ADAT Bridge attached to Mix Farm card
- ADAT Bridge configured as second interface on port A
- The XT is set to Digital input, and 48K
- I tried trashing DigiSetup several times
- The ADAT channels in the Output list of PT show up as #2 888/12, #2 888/34, etc.
- I've tried many sync combo option (888 set to Internal, ADAT Bridge set to optical, etc. )

Any words of wisdom out there? Thanks in advance for your help!!!