Custom logo size is incorrect
The documentation for using a custom logo (in the Admin Settings/Company Details page) says that the image size should be 188 x 80. However, when I make images exactly that size I get short horizontal lines at the bottom to the left and right side of the image, in line with the Home tab. See the example below:

After much experimenting, if I make the logo image exactly 205 x 80 it fills the space properly so the extra lines are not visible.