Slider on the side of open windows likes to stay at the top of a window
I think this affects nearly every program under Windows, although I'm not too sure... anyway, here's a situation: you want to scroll quickly down a large folder or webpage, etc, and using the mousewheel will take too long. So, you move the mouse pointer over to the slider on the side, hold down left mouse, and drag it down to where you want.
...Then as you let go of the left mouse button, the slider promptly resets itself to the top of the window, and you have to do all over again for a second time. What's the deal with that? I've seen this happen so many times now that it's beyond a joke. I can't think of any good reason as to why this happens, it just serves to annoy the hell out of me!