Window scrolling broken

Mouse wheel scroll stops on most windows somewhere between 2/3 and 3/4 of the way to the bottom. Normal scrolling of other types often fails completely -- eg. some windows loose the ability to be scrolled by "grabbing" the slider, can't be scrolled by clicking above/below the slider, or can't be scrolled by clicking the arrows on top/bottom.

Work-around by using one of the methods that isn't broken. So far, I've not had all 4 methods break at once.

This scrolling bug has been in the game since beta (and was bug-reported then). It has spread to all the other windows that can now be mouse-scrolled.