I performed your recommended CMD procedure and tboth of these commands state that "The system cannot find the path specified".
I believe this problem started after I assigned a new drive letter to a drive within an external USB dock. I tried to re-assign the drive letter from a "F:" to an "R" drive. When I did that, the "F:(F:)" drive is still visible in Opus (but not showing in Explorer.
The USB dock is not the problem because If I disconnect the dock, the "F:(F:)" drive is still visible (but still not showing is Explorer). I found that if I revert the name back to the original "F: the drive display's correctly in Opus and Explorer.
I tried a freshly formatted drive and assigned it with a different letter such as "L", , the problem drive letter "F:(F:)" re-appears.
After some experimenting, I tried to rename a second external USB drive that is attached to the computer. I tried to rename this drive from "S" to drive"D". The "D" drive displayed correctly. So, I then renamed back to "S"and then back to "D". Now, I have a phantom drive "S:\ (S) listed, but not in Explorer.
To add to this problem, whenever Opus is running, the delete key will not work in any program such as Word or within Explorer. If I stop Opus, the delete key works.
I did a complete uninstall and re-install of Opus. I am using 12.22 X64 Build 7593.