Version:           0.7.80 (using 4.1.60 (KDE 4.1.60 (KDE 4.2 >= 20080709)), Kubuntu packages)
Compiler:          gcc
OS:                Linux (x86_64) release 2.6.24-20-generic

When using Okulars browse tool for mouse scrolling there is a great feature that allows you to scroll over the edge of the screen by placing the mouse cursor on the bottom of the screen when it would leave the top of the screen and vice versa. I don't know if there is a name for it (something like borderless mouse scrolling maybe).
This is great and is actually one of the reasons I really like Okular.

But sadly about one in three times (I can't predict when) it doesn't work the way it is supposed to be but instead scrolls one screen down or up when I cross the screen-border. It is important to note, that it does scroll into the right direction, but instead of scrolling smoothly it jumps one screen-height too far.

Reproduce: 
-open a pdf in okular (dvi works too, backend shouldn't matter)
-scroll somewhere to the middle of the document
-use the browse tool and move the mouse back and forth over the edge of the screen several times
You should see the mentioned behavior after some tries.

 Stephan

     P.S: why does this borderless mouse scrolling only work in the vertical, not the horizontal direction?