Steps to reproduce:
1. Create empty folder
2. Delete folder, the dialog box will show the folder icon with a black line.
This is also present in the context menu selection, more specifically in the 'send to', icons are surrounded by a black edge. But hovering over them will make the black lines disappear.
I can perfectly replicate it on 3 machines (2 of which are clean installs of 8.1), other users have also confirmed it. See screenshots below.
I'm using the latest WHQL Nvidia driver if that matters.
