Close and hibernate buttons no longer present on tabs in sidewise window

I'm on win 8 and chrome "Version 31.0.1650.48 m".  The sidewise window is acting like it needs a horizontal scroll bar, but there isn't one:

- hover over bubbles disappear off the right edge of the window

- the right click menu disappears off the right edge of the window

- resizing the window (even to the full width of the screen) doesn't alleviate the issue