I just tried vers, 24, and it too has the missing scroll slider in the vertical scroll bar area (I incorrectly labeled this as a scroll bar issue. It's not. The scroll bar is there but the slider within the scroll bar is what is missing, but only in WinXP SP3. It seems to be working fine in my Win7 machines). I'm still using vers 21, which is the only recent version where the vertical slider works.
On the plus side, ver 24 does seem to be faster than 21.