PDF Results Not As Expected

[Dan Friedman]

When creating a pdf of a card, I am getting results that don't match the screen.  See if for yourself... make a new stack, and put this in a button:

on mouseUp
  --remove old buttons
  repeat with i = 1 to 4
    if there is a btn ("button" & i) then
      delete btn ("button" & i)
    end if
  end repeat
  
  --set props
  set the threeD of the templateButton to false
  set the borderWidth of the templateButton to 1
  
  --create new button
  new button "button1"
  set the bottomRight of btn "button1" to the loc of this card
  new button "button2"
  set the bottomLeft of btn "button2" to the right of btn "button1" - 1,the bottom of btn "button1"
  new button "button3"
  set the topLeft of btn "button3" to the left of btn "button1",the bottom of btn "button1" - 1
  new button "button4"
  set the bottomLeft of btn "button4" to the right of btn "button3" - 1,the bottom of btn "button3"
  
  --make the pdf
  put specialFolderPath("Documents") & "/printTemp.pdf" into tPDFFile
  open printing to pdf tPDFFile
  print this card
  close printing
  
end mouseUp

Click the button.  You'll see that the buttons line up to form a 4x4 group all as 1 px lines as the buttons overlap each other.  But, the generated PDF is not the same.  It shows the lines side by side.  Is there some setting I am missing?

LiveCode 6.6.4 rc2
Mac OSX 10.9.5
Same results on iOS 8

Any thoughts?

Thank you!!

-Dan