This question was asked before but was no answer. On shared folders on the file server, for the domain user name object under the security tab, the icon has a red x.

There are no symptoms, the users have full access, there is just a red x on the icon for their name.

Why is this?

For clarification, logged into the windows 2008 r2 file server, browse to a users shared folder, right click on the folder, hit properties, click the security tab. The object representing the users domain name has a little red x on the lower right hand corner of the icon that looks like a single man. There are no symptoms beyond me wondering why the red x is there.