I suspect your 'ConfirmConversions' implementation may be an issue. Try using:
Code:
Set oDoc = objWord.Documents.Open(Filename:=fName, ConfirmConversions:=False, _
ReadOnly:=True, AddToRecentFiles:=False, Visible:=False)
or:
Code:
Set oDoc = objWord.Documents.Open(Filename:=fName, ConfirmConversions:=False, _
ReadOnly:=True, AddToRecentFiles:=False, Visible:=True)