Version:           2.4 (using KDE 4.5.85) 
OS:                Linux

Since I have a 16:9 monitor, I like the option having the image list on the right instead of at the bottom. The scroll bar slider although seems to have a bit offset then. When the slider is at the top, it is just fine and you can drag it.
When the slider is at the bottom, or like about a half-way from the top, you “miss” it, although the hover effect indicate you are over it. Clicking it then results in the scroll bar “jumping” as if you had clicked on an empty area of the scroll bar.

Reproducible: Always