I have an issue that I reported to D-Link Tech Support that has never been followed up on:
I have a problem with the 750 clipping off the 1st second or two of each audio track I play... back when I had the DSM-520, I had a similar issue that I also reported that was never corrected.
From what I can see, it looks like the 750 (and perhaps the 520) mutes the audio outputs in between each track... when a new track plays, the audio output is not un-muted quickly enough to prevent some of the song from being clipped off. This should not be the normal behavior for audio equipment... the audio output should be un-muted at all times even if the 750 is not playing anything.
I have a Denon AVR987 receiver that shows the number of active channels playing on a device connected via HDMI/Coax/Optical digital inputs... when using the DSM 750, one can clearly see that the device is muting the output in between songs (the indicators on the Denon turn off).
Perhaps D-Link can get Redsonic, or whoever is developing the firmware, to fix this problem on BOTH the 520 and 750 as this problem exists on each model.