When using optical input #1 sound works fine but if you use OSD to switch to optical input #2 you get the sound from input #1. Also it seems to bleed over to coaxial #1 and #2 but not #3 or #4. Also none of the coaxial inputs will work or the optical #2. Confusing as hell. The digital input board is verified good. Since the digital inputs go to the DSP board next could that possibly be the problem?? Also all other features of receiver work properly.