Macro no longer works

[Halda]

Can anyone help me get a macro that was previously working fine to work again. It is update all fields and is saved in Normal.dot as far as I can tell. Has worked fine on invoices that we make up to do the totals on them. And worked fine until a week ago it just doesnt seem to do anything now. Can anybody help me diagnose whats blocking it. I have already turned off antivirus made no difference. And ALL macros are enabled in word settings.

Sub UpdateAllFields()
    ActiveDocument.Fields.Update
End Sub

The document is using restricted editing set to filling in forms this has worked fine until now.

Thanks