Disk redirection to Windows Server 2008

Hello.
I have a problem with disk redirection from terminal to Windows 2008. If
you log into a new session, disks are not redirected. But if you
disconnect from this session without closing it, and then connect again
- disks will appear!

I connect using this command:
rdesktop -k en-us -r disk:flash=/media <ip-address>

Version of rdesktop - 1.6.0.

Is this a bug or I missed something in parameters?

Thanks.

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