How do I correct File Sharing problems between 2 Lion installs?

I have having a strange problem with file sharing between 2 mac's that have Lion Installed. One is a MacPro with a clean install of Lion and the other is a MacBook that was upgraded with Lion. Both systems have file sharing enabled (just public folders for now) and I cannot connect from the MacPro to the MacBook. The other direction works fine (MacBook to MacPro).
The MacBook shows up in the finder of the MacPro, but when I click on it, it says "Connection Failed". It does then even when I "Connect As" and explicitly put in the user and password of a user on the MacBook.
The only way to connect is to use the "Connnect to Server" optin in the finder window and use the IP address of the MacBook and explicitly use a valid user and password (guest will not connect from this method either)
I have rebooted both machines and the router and have "repaired permissions" on the MacBook HDD.
Any ideas?
(I'm sure I can do a clean Lion install, but this is a real pain to get all of my wife's data backed up properly)
Thanks!

I get the same thing  -- this post makes me feel a bit better, actually .
Please see my post here: Idiosyncratic File Sharing Failure with Lion

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