This bug demonstrates what appears to be a bug in Chrome as of version 17.0.963.56.
The demo shows a left and a main panel within a container that has display: -webkit-box and which is also absolutely positioned to the height of the containing frame. The main panel attempts to use overflow-y to let the panel scroll.
Expect: The large amount of content in the main panel should force the appearance of a scroll bar.
Actual: No scroll bar. If overflow-y is forced with "scroll", the scroll bar appears.