PNG overlay with transparency problem in export

[BanjoTom]

I have frequently used the Batch Processor in IM3 to overlay a PNG image with a copyright symbol and notice onto images I want to send to others.  When I try the same thing in the Export Batch Process in IM5, the overlay image does not seem to recognize the transparent parts of the PNG.   Here (attached) is the difference in output -- the left image was done with IM3, the right with IM5.   How do I get the same overlay effect in IM5?   


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