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#1
I'm using neither, I'm not sure what Edge has to do with it but this folder icon problem is happening with File Explorer.
I can reproduce the issue. If I clear the icon cache using Disk Cleanup, restart, browse to a text file and open it, close it, go back to the root folder, change icon view to medium (previously detailed) the root folder and subfolders to that text file will have a black background around it. So it seems to happen to recently accessed files.
I've ran sfc /scannow and got no errors.
I think around the same time I noticed this problem I altered the registry to change the window title bar to black, that would make sense why the background color is black. But re-imaging back to an older state didn't fix it. I use a Microsoft account to login, do you think those registry settings could be saved in OneDrive sync? If I re-image WAY back to November, let the settings sync (this is before I change title bar color) then the window accent border color changes to black instead of blue.
If that's the case, how could I make OneDrive sync forget this PC? Unlike Windows 8.1 I don't think Windows 10 shows up as a device.
It's nothing to worry about, it's either a visual glitch in 10(I customize my icons and have seen this since the beginning of the Insider program) or wanted, for users to know that a file has a modified shortcut/.exe icon path, in case they want to move the file or folder, which would turn your custom icon into a default "paper sheet" blank icon.