I have my OMV box set up with three users; each user has a private shared folder (not advertised, ACL effectively set to 700), then within their private share is a "public" folder that is separately shared as "<name>-public" (advertised, ACL effectively set to 744). I've checked both the ACL settings on the shared folder as well as the "privileges" setting, and they both show that the owner should have RW permissions on both their private share and the "public" subfolder -- which they do -- and that the other registered users as well as guests should have RO permissions on only the "public" subfolder -- which they do not. Whenever user A tries to access the public folders for user B or C (or any other combination therein), Windows barfs up the "You do not have permission to access this folder" error.
Any ideas why? As far as I can see, both the filesystem permissions and the ACL/privileges in the GUI look right.