Hitting the 'maximize window' icon in the X1 title bar doesn't fully maximize the window on my 16:10 1920:1200 monitor. It leaves a 16 pixel wide black bar along the right edge and a 16 pixel tall black bar all along the lower window edge (above the taskbar). Using Win10's built in 'snap' feature (drag title bar against top of screen) does maximize the window correctly.
It's more than just a visual annoyance: throwing the mouse pointer in the top right corner and left-clicking doesn't close the 'maximized' window because the close icon is now 16 pixels to the left of the top right corner. Please fix.