Make shure you have maximized your IE window. Then point your mouse within the red square (see the image) and try to scroll the mouse wheel. The list will be scrolling. But if you point our mouse over the list itself and start scrolling the mouse wheel, the list will not scroll. This is a bug I suppose
Here is the image of where the mousue pointer should be and some suggestions about the nature of the bug.
I don't know if this is the IE bug or player's one.