LinuxQuestions.org - Working 14.0 smb.conf breaks in -current

I have a production machine running Slackware 14.0 (and thus samba 4.6.16). It does everything I need smooth as silk, but the world is passing it by, now even firefox-esr.

So I have to bite the bullet eventually. Upgrading to -current (and thus samba 4.13.0) was going relatively smoothly, but then I discovered that no devices could any longer recognize the existing samba share.

Reverting to 14.0 made everything magically good again.

My samba needs are simple: One read/write share called 'PublicDirectory' on /mnt/dv/public, also available to guests on the LAN.

Can anyone provide a smb.conf that will work for me?

Here is my existing smb.conf, which Just Works in 14.0. (Samba 4 spontaneously adds the 'local master' and 'preferred master' lines).

[global]
workgroup = HOME
server string = %h server
security = USER
map to guest = Bad User
log file = /var/log/samba/log.%m
max log size = 105000
dns proxy = No
hosts allow = 192.168.8.
hosts deny = ALL
local master = yes
preferred master = yes

[PublicDirectory]
path = /mnt/dv/public
read only = No
guest ok = Yes