Objects not showing post export

I have the following for all the question objects in a quiz. They are simply a tick for "yes" and a "x? for "no". They work nicely for feedback until I export where they no longer show. Any suggestions would be appreciated.
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Actions for Fill in the Blank Question "Fill in the Blank" of Page "evaluation"
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-- On question answered... -----------------------------------------------------
If score = "correct"
Set visible of PaintObject "yes" to true
Delay 3000 ms
Set visible of PaintObject "yes" to false
Else
Set visible of PaintObject "no" to true
Delay 3000 ms
Set visible of PaintObject "no" to false
End if
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Actions for Fill in the Blank Question "Fill in the Blank" of Page "evaluation"
--------------------------------------------------------------------------------
-- On question answered... -----------------------------------------------------
If score = "correct"
Set visible of PaintObject "yes" to true
Delay 3000 ms
Set visible of PaintObject "yes" to false
Else
Set visible of PaintObject "no" to true
Delay 3000 ms
Set visible of PaintObject "no" to false
End if