Hi prikryl, appreciate the quick reply. Screenshots attached. Yes, D: is available in all other situations, including CMD. It's only WinSCP which seems to dislike it! A NET USE command lists the Drive D map ok.
Just to make sure it isn't anything odd about the specific share, I mapped another share (on a different server). WinSCP doesn't list it either. Is it something to do with the WinAPI call you use to get the drive list?
Thanks for the screenshots.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.