Just to tidy things up. The cable arrived just before lunch and that fixed the last issue.
Everything is working in my Titan now, including the drive and DSD256, just fine.
I can’t say enough positive things about the support I got from Roon Community, Roon support, and @Danny. They helped through everything. And they sent the cable I needed Priority Overnight so I would get it as soon as possible.
It was my choice to get a cable rather than do an exchange. I knew I could get the cable much faster than doing an exchange.
Dan