The order of access rights in the list on the Access tab is important. When someone tries to use a share, the VisionFS server checks the details against the list. The first entry that matches determines the actions that user is allowed to perform. If no entry matches, the user is not allowed to access the server.
When you add or edit access rights, make sure the entry appears in the correct place in the list. Entries for specific users should appear before entries for any user. If an access right for any user appears before one for a specific user, the specific one is ignored.
To move an access right, drag the entry up or down in the list.