Hi,
I noticed it too !
I have several lists, some oh theme have more than 2460 items and don't have the scroll bar.
An other problem relative to scrollBar in listBox appeared : with Reader 8, i can't use the scroll bar (even if i have less than 2460 items); it appears but i can't scroll.
I see tthe french adobe team about these 2 problems next week. If we find something new, i'll tell you.
Pierre.