There seems to be some bug that has to do with Iron window states. The only time my bottom extension bar behaves normally is when I dock the window using Windows 7's split screen feature. I am running Iron 188.8.131.52 on Windows 7 x64. Screenshots are self explanatory.
When window is not maximized
When window is maximized
Window is docked to left/right half the screen (Windows 7 WinKey+ Left/Right Arrow)
Any help is greatly appreciated.