Footer background not extending down with standard theme
Operating system version
OS X 10.8.4
Description of the issue
The 'background' portion of the footer is not displaying in a standard theme (I'm using River, but have tried changing to Quarry and it behaves the same)
Steps to reproduce the problem
drag the bottom edge of a window downward to increase its size
It works fine for a while, but changing something in the layout causes it to go wrong and then the only way I've found to fix it is to recreate the layout from scratch. I haven't worked out what specifically causes it, but the last change I remember was dragging items (including a portal) into a tab control which covers most of the body section. I made sure nothing is touching the edges of the sections or tabs. I even dragged the entire tab control out onto the scratchpad area leaving nothing in the body or footer and it still behaves the same.