Jumpy slider images
I have a bunch of pictures of a bar graph and a slider which triggers them with state changes so when you move the slider up and down, it looks like you're controlling the bars to move as well.
The states show the pictures all being in exactly the same place and when my participants use the arrow keys to move the slider, it works perfectly. When they use the mouse, most see it just fine but a few of them see the pictures jumping all over the place and the slide totally loses impact.
What could possibly be going on?