I noticed today that if I zoom into a page on the forum (I did it on my touchscreen), the scrollbar, as you might hope, is not affected and stays at the right edge, but it no longer scrolls, and trying to move it with the pointer highlights/selects the images and text. If I move the enlarged page all the way to the left, then the scrollbar works as expected.
I am using the latest Chrome on Windows 8.

