I've heard of people having problems with the Power Supply units with the Delta 10/10 (which power the breakout box - which I think is where the balanced audio in/out circuitry is) - however I've got six or seven of these on the go at various places and not had any trouble myself (baring some fun driver issues when I put on in a Windows 7 box).
I'd try swapping PSU's around if you've got the chance to see if that makes any difference.
-- Myriad user since 1998, now custodian of dozens of Myriad,Autotrack, Powerlog and Scoop boxes of many different flavours. http://www.philedmonds.com
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