Hello,
I often encounter this behavior : i've published a removable media on HFS (let's say my DVD-Rom on D:\), and everythings work fine until... i remove the media. Then i get an error when i try to access HFS, and i can't browse anymore my other published directories just because the removable media isn't any more in the corresponding drive !!
This should be overriden : no error when removable media is not inserted.