It will work in all digital. Did you make sure that the i/o selects optical for both? I have it and have had no problems with this.
These websites were particularly useful for setting it up.
http://forums.audioreview.com/general-audio/thoughts-using-behringer-deq2496-room-correction-16568.html
http://www.decdun.me.uk/deq2496.html
http://www.nu9n.com/deq2496.html