Hi, If Brano's answer is not your case, I would like suggest you post the issue to the porper support forum Windows Server forum for further help. Regards.Spencer TechNet Community Support

We use AD in a server 2008 R2 environment. We have at least 5 users that are losing their local admin rights after a reboot or shutdown. I can't see anything for sure that they all have in common. Are there any apps that are known to cause wacky symptoms like this? Please advise, readding all of these users every time this happens is getting painful. Thank you.

This would be group policy "Restricted Groups" if it happens every time after reboot. Check your group policies someone must thave set Restricted Group for the Local Administrators group. http://www.windowsecurity.com/articles/using-restricted-groups.html

I moved it to servers as there is no gpo that is causing it. It affects only 6 users at this time, not the whole 500 that have local rights across campus. Also, only 4 of the 6 are in one organizational unit, the other two are in totally different ones, even to each other.