Yap version 0.99a running on Windows XP.
The page number in the lower right corner of the screen
in the status bar does not refresh itself while changing
pages by dragging the scroll bar with the mouse until
after the mouse is released. It would be nice if the page
number would refresh itself during the scrolling to make
it easier to find a specific page in long document.
The paper number does refresh itself while scrolling if
the scrolling is done using the up and down arrow keys.