You MUST install the usdir files and other support files in /drive0/roadmap (not /drive0/var/roadmap) as the install document says. That is unless you change the preferences files which you must put in /usr/share/roadmap (did you do this also?). The preferences file has a line which tells the roadmap code where to look for map files. I would say try to Install again using the same directory structure I mention in my install document.. if that doesn't work it's probably your FTP program corrupting the file.