Can you update to the latest version NAS-R3_ver_5_0_up47_build_3200. Before updating please save your settings in MAINTENANCE -> miscellaneous -> Function: Save settings. Then select all the options.
Once rebooting set the ACL permissions for the users and groups from the GUI CONFIGURATION -> NAS resources -> Function: ACL (Access control list). Also from the Domain server go to the share and then access the properties and then set from the security tab and check to see if the everyone group has access or uncheck and test. Additionally links below might be of some help.
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