Or set a guest user, coz in your [DOCUMENTS] share you say
guest ok = yes, but in the [global] you say
map to guest = Bad User..
also make sure you added the right users with smbpasswd.
and ofcoz' you have to make sure the rwx rights are ok for
you should make a open share with all permisions wide open
and from there on do some tests with what is ok for you and not.