Cannot change desktop icon

Sometimes a desktop icon changes from what it was to a plain white folder. Might be something I did but not sure what.

To change it to the icon I want, I go:

1. Rt-click icon > Properties > Change icon
2. I select the icon I want from the thumbnails of icons.
3. Click OK
4. Click Apply

But the icon does not change. It just stays looking like a white folder.
HOWEVER, if I pin the icon to the taskbar, the icon on the taskbar does look like the icon I selected in step-2. So the change is registered with Win10 but the icon on the desktop just doesn't change.

Any ideas on how to fix this?

What ever caused the problem, there appears to be a bug in Win10 that registers a desktop icon change via my previously mentioned procedure but does not change the icon on the desktop if certain unknown conditions exist. I had been trying to change the white folder icon to the proper icon for that program. Pinning that same shortcut (with the white folder icon) to the taskbar displayed the proper icon.

I created a new desktop shortcut to the subject program and that new desktop shortcut automatically showed the proper icon. The thing is that the existing white folder icon changed to the proper icon also at the same time.

Apparently creating a new desktop shortcut made a new "proper" registration with Win10 which then allowed the existing (old) shortcut to display the proper icon. If Win10 developers read this, this is a bug that you might work on. This problem of not being able to change the white folder icon has happened several times in the past, this is not the first time. I'll bet that it has happened to others also.

Anyway, my current problem is solved.