CIFS busted after upgrade to 9.3

Hi all

I upgraded to 9.3 and now CIFS sharing is broken.
From my windows computer, I cannot access \\nas, or \\nas\share
My computer will hang for about 10 minutes while it tries to connect to the NAS.
I can telnet to the NAS on ports 137, 138, 139, and SSH
I just want to have guest-only access, full read-write permissions for guest.

CIFS is enabled, I have tried the wizard, I have tried re-creating the guest account, and deleting and re-creating the shares. No dice

Any ideas?
Is there a...

CIFS busted after upgrade to 9.3