Doesn't fully maximised on Windows 7 when Taskbar uses small icons

In my Windows 7 64bit, there is a gap between Sublime Text 2 window and the Taskbar when Taskbar has been set to use small icons. The gap is nearly the size of the Taskbar when it is normal size.

I've tested on having the Taskbar postion on top and at the normal bottom position. It is only effected using those position but not left and right Taskbar position.

As shown below:
Top Taskbar position


Normal bottom Taskbar position: