You have to target the right storyrange:
Code:
Sub ScratchMacro()
'A basic Word Macro coded by Gregory K. Maxey
Dim oRng As Range
Set oRng = ActiveDocument.StoryRanges(wdTextFrameStory)
Do
With oRng.Find
.Text = "Test"
While .Execute
oRng.Select
Wend
End With
Set oRng = oRng.NextStoryRange
Loop Until oRng Is Nothing
lbl_Exit:
Exit Sub
End Sub