GUID in event log

When I view the security event log using hyena 5.7c I see that the username is not listed in the description field the way it should be. Instead a GUID is there. If I look at the event log directly, using the event viewer or computer management it lists the user correctly.

I am trying to find out who added a user to the local admins group. The is eventid 636, but since the username isn't listed, I cant tell for sure that this is the right user. I should add that the user I am looking for is a domain account.

Is there any way to do this in hyena?

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