Can't Access Network Shares

[sjd]

I recently added a my book live duo to the network and I'm having trouble accessing shares through Sandboxie. From another post, (http://www.sandboxie.com/phpbb/viewtopic.php?t=11479) I followed the suggestion about giving full access to the file sharing subsystem.

Go to Sandbox Settings > Resource Access > File Access > Full Access
and add the items
\Device\Mup
\Device\LanmanRedirector

It didn't work, and I did make sure that \Device\Mup wasn't listed under the blocked resources. Is there something else I could try?