minor "UNC path" bug

WinSCP v4.0.6
OS: Windows XP Pro that has "My documents" redirected to "\\server\users\username\My Documents"

Start winscp and login to a server.
Try to change to folder "My documents" using the drop down menu that usually shows "C:" after login.
=> The error "UNC paths are not supported. <OK>" is displayed twice.

OK, what do you consider bug? The fact that you cannot open the folder or that the error is displayed twice?