QGIS » QGIS Application

QGIS composer screen doesn't fit into the screen height and will not allow itself to be resized any smaller. I can use alt+drag to move the window up or down and dragging the window edge will resize it larger. The smallest height it will allow itself to be is 810 px. My screen size is 1366x768 pixels.

There's no obvious reason for this lower limit in window height, as it looks like nothing in the composer window would have problems with a smaller window height.