Basically when set to windowed mode, CK2 doesn't use the entirety of the screen even when set to the full resolution of the monitor. An image probably is the best description here. Monitor is 1680x1050, and this is what the bottom of the screen looks like when CK2 is set to 1680x1050.
There's 5 pixels unused at the bottom even by the border. I have 1037 pixels of playable area height.
And this is what it looks like when CK2 is set to 1680x1045 - notice that the UI buttons are no longer (completely) clipped, but the same 5 pixels are unused. I still have the same 1037 pixels of playable height.
Now when set to 1680x900 just to see what happens - things work as expected, and I have 900 pixels of height in the playing area.
EDIT: And then to 1680x1037 - I get 1037 playable area, and the 5 pixels are now "used".
There's 5 pixels unused at the bottom even by the border. I have 1037 pixels of playable area height.
And this is what it looks like when CK2 is set to 1680x1045 - notice that the UI buttons are no longer (completely) clipped, but the same 5 pixels are unused. I still have the same 1037 pixels of playable height.
Now when set to 1680x900 just to see what happens - things work as expected, and I have 900 pixels of height in the playing area.
EDIT: And then to 1680x1037 - I get 1037 playable area, and the 5 pixels are now "used".
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