Another thing you can do, is to place this code in Normal Template's This Document module, then place a button on the quick acces toolbar with this macro assigned, to update fields whenever you decide to...
Code:
Sub UpdateAllFields()
Dim oStory As Range
For Each oStory In ActiveDocument.StoryRanges
oStory.Fields.Update
If oStory.StoryType <> wdMainTextStory Then
While Not (oStory.NextStoryRange Is Nothing)
Set oStory = oStory.NextStoryRange
oStory.Fields.Update
Wend
End If
Next oStory
Set oStory = Nothing
End Sub