Hi Robert -
I'd guess that the images were moving in the slideshow - possibly using the Motion template? I've had that same issue a lot. As Steve says, it's a problem with images containing repeated fine patterns... and both the images you attached have that!
On top of that, you/we have the problem of what PD (still) does with motion. Added onto that, you're outputting to DVD quality. Those things combined don't make a very good recipe.
I just produced your two images in a motion slideshow. First as AVC 1920x1080 28MBps, with no distractingly obvious shimmer. It was there, but you had to concentrate to see it. Then I produced to MPEG-2 DVD HQ and there was moire all over it!
Here's an example
http://youtu.be/moFK5iZD6BU
Steve's idea of a little blur might work - never tried it myself... but I have seen over-sharpened images misbehave terribly. I just try to avoid using photos with repeated patterns in motion slideshows.
All of that said, it does NOT answer your original post. That's a mystery. Without a menu, there was shimmer. With a menu, it was gone!
I wouldn't have thought the menu (or not) would have any impact at all.
Cheers - Tony
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