I just noticed this by accident. A little white line can be seen under the exit button on hovering.
On some resolutions it can't be seen, on some its obscure. Can be seen clearly on:
800x600, 1152x864, 1280x1024, 1024x600, 1280x720, 1440x900, 1600x900, 1600x1024, 1680x1050, 1768x992
osu! version: 20150204cuttingedge
On some resolutions it can't be seen, on some its obscure. Can be seen clearly on:
800x600, 1152x864, 1280x1024, 1024x600, 1280x720, 1440x900, 1600x900, 1600x1024, 1680x1050, 1768x992
osu! version: 20150204cuttingedge