Hi Mike -
I've had the same motion artifacts you're referring to, even though motion in preview (similar slow pans and zooms) was as smooth as silk.
Only this morning, I produced a motion type slideshow & every now & again the produced video - 1920x1080 AVC H.264 @ 16MBps - would have a little spasm. Producing with hardware acceleration turned off resolved that.
Oh - maybe you're only talking about the disc you burnt??? or were the artifacts present in the produced file?
If you burnt an AVCHD DVD it will play in a BR player, compatible DVD player or Play Station. I have no idea why it would have opened in Power2Go.
Cheers - Tony
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