I get drive C: on my networked computer when I try to access drive D: You can see in the accompanying jpeg file that I get exactly the same directory list for C: and D:, but D: is clearly distinct from C: on the network computer. I am using the latest version 12.17 on both computers, and I have rebooted both computers, but the problem persists.
Good call! Same problem with File Explorer. Drive D was not installed and drive C was shared as C and D. I only recently began using drive D, and this was the first time I tried to access it from my laptop.
Sorry to have bothered you with my problem, but your help made it easy to identify and fix.
I really like Opus. I have been using it for a long time.