The write protect tab on the MD *is* closed, and the MD is writeable. I just managed to record a brief track on this MD.
The error happens regardless of which direction the transfer goes. If you try to send MD to My Library, it fails with the above error. If you try to send from My Library to MD, it fails with exactly the same error.
I suspect there is a problem with Sonic Stage running under Windows 7.
Is there a more recent version of Sonic Stage available, tested to work with Windows 7?
Thank you for help.