Looking at the video, the behavior shown seems correct to me.
It looks like you’re doing touch/finger scrolling in which case the scroll direction is opposite to scrollbar but intuitive in that it scrolls like a piece of paper would move if you dragged it with a finger.
I don’t think the video shows scrolling with the scrollbar in that it doesn’t look like you’re actually grabbing the scrollbar and using it scroll but scrolling with touch gestures on the window’s area.
But I’m not sure if you’re saying that:
a) you try to scroll with a scrollbar and it goes in a different direction, to which I say: it’s not scrolling with scrollbar but with touch gestures
b) you’re scrolling with touch gestures but you expect it to scroll in a different direction. To which I say: we scroll the way Windows tells us so all other apps that recognize touch scrolling should scroll in the same direction (e.g. Chrome or IE or Explorer)
To put it differently: in 1.9 we’ve added support for touch gestures. One of those gestures is scrolling with a finger.
Before 1.9 we would not do anything in that case. In 1.9 we scroll the document in the direction Windows tells us.
It’s possible that for apps that don’t support touch gestures directly, the driver detects a scrollbar and sends scrollbar events in some direction, which is the opposite of what natively supported touch scroll would do but I can’t say anything definitive as I don’t have access to the exact hardware/driver you have.