You shouldn't need to add users to the security settings of a GPO. If you want to apply the policy, therefore the script to all users in the OU, you just need to link the GPO to the OU. Leave the security filter to "Authorised Users".
Check
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>The OU you are wanting to affect contains the USERS and NOT the COMPUTERS.
>Make sure the USERS are in a proper OU, NOT the default "Users" container, unless you are applying it to the domain root level.
>Make sure that you are actually running a USER SETTINGS/LOGON SCRIPT and not a COMPUTER SETTINGS/START UP SCRIPT. If you have set USER LOGON SCRIPTS and applied it to an OU that contains COMPUTER ACCOUNTS AND NO USER ACCOUNTS (or not the users you want), then the policy settings will not be applied, even if the users are logging on the machines in that OU.
>Remove any Group Filtering changed you've made and reinstate the Authenticated Users group. (YOU HAVE TO REINSTATE THIS Authenticated Users GROUP OTHERWISE NOTHING WILL GET THE POLICY.
Download the Group Policy Management Console from here -
GPMC and run the Group Policy Modelling Wizard. Make sure you enter the exact User Account and Computer Account to run the modelling on, and don't use the default WHOLE CONTAINERS. This will help you drill down the exact problem. If you need help with the Modelling wizard, let us know, its pretty self explanitory. Don't change any of the settings in it though, just the user and computer (PS. you need to enter the domain\user and domain\computer).
I really do advise not using Security Group filtering if you don't have a good grasp of the processing of group policy. Start will it without any security group filtering, just link it to the OUs, then if you want to drill down further, go back and add the security.
Hope this Helps.
Neil J Cotton
njc Information Systems
Systems Consultant