Classe Delta Pre Mk II problems

I have a brand new Delta Pre Mk II.  I have two problems with it that Classe has not been able to resolve.  Has anyone on Audiogon had similar issues and possible solutions?

Problem 1: When I try to stream 192 kHz sampling rate files from my Aurender N20 via the AES/EBU input there is no sound at all.  I can stream 192 kHz files via the coax connection and via Toslink.  (Changing the cable made no difference and the N20 successfully streamed 192 kHz files to a NAD M33 with the same cable.)

Problem 2: Classe advises against installing their HDMI board in the Mk II, saying although a friend who updated his Pre to Mk II spec had no problem with it.

If anyone has experienced similar issues I would appreciate any suggestions.