I’ve taken a new VM and installed EsayNAS 0.7.2 with the same configuration you described
but everything worked correctly.
I can think of one thing, if you’ve started samba from CLI the on/off buttons won’t work for you,
since easynas is using a diffrent service named: easynas-smb
and the configuration is located under /etc/easynas/smb.conf and not /etc/smb.conf
I hope it helps.