Comment 19 for bug 731976

I've made an interesting discovery, if someone also experiencing the problem could also check it:

If you add, 'public = yes' (without quotes) to the share, and remove any valid users, read list, force user, etc, are you able to access the share?

This seems to be working for me, and seems to be a valid temporary workaround, unfortunately, this will completely disable any form of access control, or write privileges.