Are you sure the drive is mounted? check with the command.
Originally Posted by paulyphonica
then check you can access the files as the user that runs LMS (I am not sure which user that is at present, but and search through for the running program will tell you the user it is running as). Let's call it logitechuser
That'll tell you if that user can see the files.
sudo su -c logitechuser
ls -lR /media/mountpoint/path/to/music
Also LMS does create log files. Have you looked at them after a scan?