Hello,
I'm currently using Newsbin 6.50 RC4 Build 3121. That's on WinXP Prof. SP3 (32-bit). I don't know if this problem existed before, because I just noticed it for the first time.
I have the "Downloading Files" tab open in Newsbin; the window is maximized to screen size. Because I've expanded a set of files in the list, I see the scrollbar at the very right of my screen.
Usually I move the mouse pointer to the very right to be able to click on the scrollbar. But now this doesn't work, because the scrollbar is not docking to the border of the screen. There is a very small gap between the real right border of the screen and the scrollbar. So I have to move the mouse pointer a little bit to the left -- then I can click the scrollbar and move it up and down. And this can get very annoying over time!
You won't notice that behaviour if you have a mouse wheel at hand. But if you're on a notebook keyboard without a mouse wheel... You'll be always moving the pointer to the very right and click&move! But you'll click into the small black space between scrollbar and screen border -- instead of clicking the scrollbar -- every time.