Intermittent: In the Carousel block, sometimes a set TWO images are "linked" to ONE image. Then, when the right-most image is clicked, the leftmost image is brought to the center. When the left-most image is clicked, the right-most image is centered. Sometimes, this happens with more than one set of two images in the same returned dataset.
Here is an example mashup (just click Go): http://www.popfly.ms/users/DonG/ShowCarouselBug-Mashup
If it doesn't show up at first, enter another search item and press Go. Or, re-load the page and try again.
In the mashup, if you change the Carousel imageURL value from thumbnailURL to mediaURL, things get even stranger.