Did the HN scrollbar disappear for everyone too?
I don't know if it's just me but I no longer have a vertical scrollbar while reading HN on Chrome. This is a minor thing, but I find it has an actually significant effect on my reading habits. Not knowing how much is left is causing me not to "stick it out" and finish the page. Or tends to cause me not to comment if I think (and can't tell) that there's too much existing opinion already provided by others.
I just tried Chrome on Windows, and the scroll bar works OK on HN.