Sharepoint cannot resolve AD security group

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I was banging my head against the wall over this one for a few days.  There was a particular AD security group (over 1000 users) that sharepoint could not resolve.  Nothing about it (so I thought) was different than any of the groups that sharepoint could resolve.  Same setup, OU and everything.

Finally, I realized that the Alias name was not the same as the standard object name which is called the "Pre-Windows 2000" name in Active Directory. 

In 99% of all the cases, these are the same.  For some reason, this time they weren't. 

Hope this saves someone some grief.