FC11 Cannot mount windows shares using netbios names

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http://forums.fedoraforum.org – I've had my FC11 x86_64 installation up and running for 6 months. Until a week ago, I was able to mount windows shares through Nautilis using their netbios names. About a week ago, this all broke with no tinkering on my part. Now, I can mount the shares using the IP address, but not using the netbios name. When I make he attempt either from scratch or by using a previously working bookmark, I get "cannot display location "smb:\\..." When I browse the network using Nautilis I can see the workgroup, but when I try to open it, I get "unable to mount location. Failed to retrieve share list from server." When I use nmblookup with the netbios name, the correct ip adress is returned. The problem seemed to correspond to a software update that occurred on 2009-11-21 that included updates to selinux-policy and selinux-policy-targeted. SE Linux has the System Default Enforcing Mode set to disabled. The system default policy type is set to targeted with no other options available. The nsswitch.conf file appears to have been changed on the same date, but reverting back to the backup version of the file failed to solve the problem. Samba is up and running. My linux shares are accessible from my windows boxes. The firewall is open to smb and smbclient. I've found a whole host of similar problems described in similar posts, but have not been able to solve the issue with any solution suggested. Any suggestions on further diagnosis or solution of this problem would be greatly appreciated. (HowTos)