Windows 7 and Java Version 7 Update 55; Java 8 Update 5 / Update 20
What I expected to happen was for the list to scroll down.
What actually happened was that when I scrolled down, the list scrolled in reverse.
Steps To Reproduce:
1. Go to Mutliplayer or World Customization.
2. Scroll the scrollbar with the cursor on the inside, then do it on the outside.