I am running into an issue whereby the icons for things like 'Music', 'Movies' and 'Pictures' in the windows of the Finder side bar are showing up as generic document icons. I should note, that device icons are displaying correctly.
Also, if I relaunch the Finder then the icons disappear and I need put them back, via the Finder preferences.
Can anyone suggest a solution?
I am using macOS X Sierra (10.12).
Below is screenshot illustrating what I am seeing: