Setting ACLs via powershell

Hello,

We're trying to automate creation of folders via powershell.  After running through our script to get the right share, folder, etc we are calling this powershell script: http://www.powershell.nu/wp-content/uploads/2009/02/setfolderpermission.ps1

The command successfully can see if a folder exists and can create a folder however the "SetACL" function returns:

     Creating \\SERVER\SHARE$\PATHINFO\USERX

     Adding Permission: FullControl For: USERX

Set-Acl : Attempted to perform an unauthorized operation.

At C:\ISLONSCRIPTS\set-folderpermission.ps1:93 char:9

+     Set-Acl <<<<  -aclobject $GetACL -Path $Path

    + CategoryInfo          : PermissionDenied: (\\SERVER\SHARE$\PATHINFO\USERX:String) [Set-Acl], UnauthorizedA

   ccessException

    + FullyQualifiedErrorId : System.UnauthorizedAccessException,Microsoft.PowerShell.Commands.SetAclCommand

It doesn't appear that the ISILON is responding to the "Set-Acl" cmdlet as expected.  However through the windows GUI, this same permission can be granted using the same userid that the script is being run (so I don't think its a permissions issue).

I've also attempted to do some simple testing of the cmdlets using the examples from the TechNet site: http://technet.microsoft.com/en-us/library/hh849810.aspx

Get-Acl seems to return user access, ownership information, etc as expected.  I also attempted to copy a set of ACLs from one folder on the isilon to another following example 1 from the above powershell Set-ACL site (cat and dog) however I still get the exact error as the setfoldermission.ps1 powershell script.

Any ideas/suggestions?