[Samba] Root user cannot logon to share

[John Zoetebier]

After installing samba-server-3.0.2a-3mdk
on Mandrake 10.0 I cannot logon to a disk share as root anymore.
I have added root as a user using SWAT.
Whenever I click on a disk share from a client machine like Windows 2000 I
get a logon prompt.
When I enter the credentials fo root logon fails.
Other users can login properly.

What can cause this problem ?
Has something changed in the way Samba works ?

-- 
John Zoetebier