Answered my own questions by signing up on JRiver forum and verified all the hardware is working well by playing DSD128fs files via Foobar2000.
Bad news on Jriver was that the current MC17 version will not support DSD128fs DoP but it did work with DSD64fs files.
The MC18 wasn't released yet although I had purchased the license - (pre-sale - good business model - although we used call it in my earlier software business days - vaporware). Judging from the list of fixes and adds, Jriver had been busy and will take another couple of weeks before the prime time.
Good news, there's a new post in the JRiver forum this morning where it lists all the new functions to be included in MC18. For my interests,
NEW: Added support for DSD DoP bitstreaming of 2x DSD (128FS).